Seita (NEXZ) Profile 2026: Age, Bio & Facts
Seita, also known as SEITA (세이타 / セイタ), is a Japanese singer and member of NEXZ, the seven-member boy group created through JYP Entertainment and Sony Music’s Nizi Project Season 2. Born on November 28, 2006, in Saitama, Japan, Seita earned the final seventh spot in the survival project and officially debuted with NEXZ on May 20, 2024, through the single album Ride the Vibe.
As of September 2026, Seita is 19 years old and remains an active NEXZ member. The group has since expanded from its Korean debut into Japanese releases, nationwide touring, arena shows and its first Asian tour announcement. NEXZ’s latest Korean release at the time of this article is the fourth mini album SAUCIN’, released on August 24, 2026.
One detail that makes Seita’s profile especially interesting is how much of his identity was shaped before debut. During Nizi Project Season 2, his rankings improved through the Korean stages, moving from ninth in the individual-level test to sixth and then fourth in later evaluations before he was selected as the final member. He has also taken part in NEXZ’s creative work: Seita is credited as a lyricist on the group’s “Next To Me.”
Quick Facts About Seita
| Fact | Information |
|---|---|
| Stage Name | Seita / SEITA |
| Korean Name | 세이타 |
| Japanese Name | セイタ |
| Birth Name | Kawashima Seita (河嶋星太) |
| Date of Birth | November 28, 2006 |
| Age | 19 as of September 12, 2026 |
| Zodiac Sign | Sagittarius |
| Chinese Zodiac | Dog |
| Birthplace | Saitama, Japan |
| Nationality | Japanese |
| Blood Type | A |
| MBTI | ISTJ is listed in recent profile databases; older profiles list INFJ/ISFJ |
| Group | NEXZ |
| Position | Rapper, vocalist |
| Agency | JYP Entertainment |
| Korean Debut | May 20, 2024 |
| Debut Release | Ride the Vibe |
| Nizi Project Final Rank | 7th |
| Fandom | NEX2Y |
| Official Group Color | Not officially confirmed |
| Current Status | Active NEXZ member |
The birth date, name, birthplace, blood type and seventh-place result are supported by Japanese entertainment coverage and established profile sources; NEXZ’s official site independently confirms Seita’s November 28, 2006 birth date and his membership in the seven-member group.
MBTI note: this is one of the facts that should not be frozen into a single lifelong label. KProfiles’ current version lists ISTJ, noting previous ISFJ and INFJ results, while Kpopping still lists INFJ. Because those sources document changes rather than a single stable official profile, the safest wording is that Seita’s MBTI has changed over time and is currently reported as ISTJ by some updated databases.
Table of Contents
Who Is Seita From NEXZ?
Seita is one of the seven members of NEXZ, alongside Tomoya, Yu, Haru, So Geon, Hyui and Yuki. NEXZ was formed through Nizi Project Season 2, a Japan-Korea audition project jointly associated with JYP and Sony Music. The official NEXZ profile describes the group as a global boys group and explains the name as “Next Z(G)eneration.”
Seita’s path into the lineup was different from a traditional agency-only debut. He entered the spotlight as a contestant on Nizi Project Season 2, where his performance evaluations gradually improved. He did not place near the top in the earliest Japanese-stage rankings, but his progress during the Korean training stages helped him secure the final position in the debut team. ORICON’s detailed profile records his final rank as seventh and notes that he was the last member revealed.
Within NEXZ, profile databases identify Seita primarily with rap and vocals. Those role labels have been documented by KProfiles, which cites NEXZ-related official content for position information. The official agency and Japanese company profiles, however, generally present the members without a detailed position list, so “rapper and vocalist” is best understood as his established member role rather than a formal hierarchy such as “main rapper.”
NEXZ: The Group Behind Seita
NEXZ was created through Nizi Project Season 2, with the final lineup revealed in December 2023. The group released the pre-debut song “Miracle” on December 18, 2023, before officially entering the market with Ride the Vibe on May 20, 2024.
The seven members are:
Tomoya, Yu, Haru, So Geon, Seita, Hyui and Yuki.
The official Japanese NEXZ profile confirms the seven-member lineup and describes the team as coming from the joint JYP/Sony audition project.
The group followed its Korean debut with a Japanese debut on August 21, 2024, through Ride the Vibe (Japanese Ver.) / Keep on Moving. Sony Music reports that the Japanese release reached No. 1 on the Oricon Daily Album Ranking, while the first Japanese showcase tour sold out all six performances across three cities and drew approximately 40,000 attendees.
NEXZ then progressed through NALLINA, O-RLY?, Beat-Boxer, Mmchk, Hellmate and SAUCIN’. By 2026, that development had expanded beyond conventional comeback promotion into arena touring and an announced Asian tour.
Seita’s Birth, Nationality and Early Background
Seita was born on November 28, 2006, in Saitama Prefecture, Japan. His full name is generally reported as Kawashima Seita (河嶋星太). Japanese entertainment coverage from ORICON and ViVi both identify him as a November 28, 2006-born member from Saitama, with blood type A.
Before becoming a NEXZ member, Seita had experience in front of cameras. Several Japanese and K-pop profile sources describe him as having worked as a model from a young age, with KProfiles reporting a seven-year period before joining JYP as a trainee. Because the seven-year figure comes primarily from profile/database reporting rather than NEXZ’s current official biography, it should be treated as reported biographical information rather than an agency-certified statistic.
His public profile also shows interests that extend beyond music. In a ViVi interview, Seita said he enjoys quiet personal time, including reading, gaming and drawing. He also talked about liking waffles and having an interest in fashion.
Education
A specific school, graduation record or detailed educational history has not been reliably confirmed through the sources reviewed for this profile.
Education details: This information is not publicly available.
That is preferable to repeating school names found on unsourced fan pages.
Seita’s Nizi Project Season 2 Story
The survival show remains one of the most important chapters in understanding Seita’s career.
ORICON’s retrospective profile provides a useful picture of his progression:
| Nizi Project Season 2 Stage | Seita’s Rank |
|---|---|
| Japan Camp – Dance Evaluation | 17th |
| Japan Camp – Vocal Evaluation | 6th |
| Japan Camp – Final Ranking | 11th |
| Korea Camp – Individual Level Test | 9th |
| Korea Camp – Team Competition | 6th |
| Korea Camp – Team Battle | 4th |
| Final Ranking | 7th |
This progression is important because Seita’s debut was not simply a continuation of an early top ranking. He entered the Korean stages outside the eventual debut positions and continued to climb.
For his individual-level evaluation, he performed Stray Kids’ “CASE 143.” KProfiles records that performance as part of his Nizi Project Season 2 history.
When the final lineup was announced, Seita became the seventh and final member revealed. His own reaction emphasized both relief and determination; ORICON preserved his comments from the final episode, where he expressed gratitude for being selected and a desire to improve further.
That final placement also explains why his pre-debut story is often discussed in terms of gradual improvement rather than instant dominance.
Seita’s Debut With NEXZ
NEXZ made its official Korean debut on May 20, 2024, with the single album Ride the Vibe and its title track of the same name. JYP’s official discography identifies May 20 as the release date and introduces NEXZ as a group formed through Nizi Project Season 2.
Sony Music reports that Ride the Vibe reached No. 1 on Hanteo’s Daily Physical Album Chart in Korea, while the title-track music video surpassed 10 million YouTube views within three days.
For Seita, the debut marked the transition from survival-show contestant to working idol. His public schedule quickly expanded from album promotion into Japanese appearances, showcases, interviews and group performances.
Seita’s Role in NEXZ
Seita is commonly identified as a rapper and vocalist. KProfiles’ updated NEXZ profile lists both positions and notes that Seita’s rapper role was confirmed through official NEXZ-related content.
His role is interesting because he does not need to be confined to one narrow performance category. The available credits and performances show participation in both vocal and rap material.
In particular, Seita became part of the writing team for “Next To Me,” a track on NEXZ’s third mini album Beat-Boxer. Shazam’s music credits list Seita among the lyricists, while NEXZ profile research citing KOMCA records him as a lyric writer for the song.
That credit is one of the more meaningful facts in his 2026 profile because it demonstrates creative participation rather than simply performance.
Seita as a Lyricist: “Next To Me”
The song “Next To Me” appeared on Beat-Boxer, released October 27, 2025. The official NEXZ album page lists the song as track five.
Song credits identify Seita as one of the writers alongside other NEXZ members and professional songwriters. The available credit records distinguish writing from composition and arrangement, so it is more accurate to say Seita received a lyric-writing credit rather than describing him as the song’s composer or producer.
This is a useful marker in his artistic development. NEXZ’s output increasingly included member participation in creative credits, and Seita’s contribution gives readers a concrete example of how his role has expanded beyond simply appearing on stage.
Seita’s Personality and Interests
Public interviews offer a more dependable picture of Seita’s interests than anonymous “personality facts.”
In ViVi’s NEXZ interview material, Seita mentioned that he values time spent by himself. He described activities such as reading books, playing games and drawing, and also said he likes the atmosphere of opening a window in the morning for fresh air and sunlight.
He has also spoken about food preferences. In the same interview, he highlighted waffles, explaining that he likes rounded foods such as hamburgers and doughnuts as well.
Fashion is another recurring interest in his profile. KProfiles lists an interest in fashion, while Japanese media coverage has included him in fashion-focused NEXZ features such as the group’s 25ans appearance.
These details don’t establish a grand personality theory- and they shouldn’t. They simply show the quieter side of a member whose professional life is increasingly built around music, performance and touring.
What Does Seita Want to Become as an Artist?
One of Seita’s earlier public statements about his aspirations came during Nizi Project Season 2. Asked what kind of artist he wanted to become, he said he hoped to be admired not only for singing and dancing but also as a person. ORICON reproduced that response in its NEXZ member profile.
His later interview comments point in a similar direction.
During a 2024 25ans feature, Seita described NEXZ’s future in terms of adding the members’ individual colors to music and creating different shapes through that combination. He said he wanted audiences to see NEXZ continuing to grow and change.
That idea fits NEXZ’s actual release history. The group has moved from Ride the Vibe into noticeably different concepts such as NALLINA, O-RLY?, Beat-Boxer, Mmchk, Hellmate and SAUCIN’.
Seita Family Background
This is an area where restraint matters.
Some profile databases publish sibling information, but the available sources do not agree consistently. KProfiles says Seita has an older brother, while a separate fan-maintained NEXZ wiki lists an older sister. Because those accounts conflict and neither is sufficiently authoritative to settle the discrepancy, the sibling detail should not be presented as established fact.
Detailed family information is not publicly available.
The same standard applies to parents’ occupations, private addresses and other family details.
Seita Relationship Status
There is no publicly confirmed relationship information for Seita from a reliable agency or major publication.
Accordingly:
There is no publicly confirmed relationship information available.
Dating rumors, fan shipping and social-media speculation are not included in this profile.
Seita Height, Weight and Other Physical Statistics
Height and weight are two of the most frequently copied numbers on K-pop profile pages, but they are also among the least reliably documented facts when an agency does not publish them.
KProfiles and Kpopping currently list Seita’s height and weight as unavailable/unknown. No reliable current official NEXZ profile reviewed for this article provides those figures.
Therefore:
| Physical Detail | Verified Information |
|---|---|
| Height | Not publicly confirmed |
| Weight | Not publicly confirmed |
| Blood Type | A |
| Birth Date | November 28, 2006 |
| Zodiac | Sagittarius |
Seita MBTI: INFJ, ISFJ or ISTJ?
This is another example where old profile pages can become misleading.
Earlier NEXZ profiles documented Seita as INFJ, with later updates recording ISFJ and then ISTJ. KProfiles’ current member page identifies ISTJ as the latest type, while Kpopping still shows INFJ.
The evidence therefore supports this conclusion:
Seita’s MBTI has changed over time, and ISTJ is the current type listed by updated profile sources, but it should not be presented as an immutable fact.
For a 2026 biography, that distinction is more accurate than copying an older INFJ entry without context.
Seita’s Discography With NEXZ
Seita has participated in NEXZ’s group releases since debut.
| Release | Date | Type | Seita’s Connection |
|---|---|---|---|
| Miracle | Dec. 18, 2023 | Pre-debut single | NEXZ member |
| Ride the Vibe | May 20, 2024 | Korean single album | Debut release |
| Keep on Moving (Korean Ver.) | Sept. 23, 2024 | Digital/single release | Group release |
| NALLINA | Nov. 18, 2024 | 1st mini album | Group member |
| O-RLY? | Apr. 28, 2025 | 2nd mini album | Group member |
| Beat-Boxer | Oct. 27, 2025 | 3rd mini album | Includes “Next To Me,” with Seita lyric credit |
| Mmchk | Apr. 27, 2026 | 2nd single album | Group member |
| Hellmate | June 24, 2026 | Japan 3rd EP | Group member |
| SAUCIN’ | Aug. 24, 2026 | 4th mini album | Latest Korean release |
NEXZ’s official JYP discography confirms the Korean release sequence through SAUCIN’. The official SAUCIN’ page lists six tracks: “LOCO,” “SAUCIN’,” “APPETITE,” “UPGRADE,” “20 NOW” and “ALIENS.”
Seita’s Major Career Timeline
December 2023 – NEXZ lineup revealed
Seita finished 7th in the final ranking of Nizi Project Season 2, securing his place in NEXZ as the final member announced.
December 18, 2023 – “Miracle”
NEXZ released “Miracle,” a song performed during the final stage of the audition project, as a pre-debut release.
May 20, 2024 – Korean debut
NEXZ officially debuted with Ride the Vibe.
August 21, 2024 – Japanese debut
The group debuted in Japan with Ride the Vibe (Japanese Ver.) / Keep on Moving.
November 18, 2024 – NALLINA
NEXZ released its first mini album, NALLINA.
April 28, 2025 – O-RLY?
The second mini album O-RLY? produced a substantial increase in physical sales. Hanteo recorded 239,443 first-week copies, more than double NEXZ’s previous first-week record of 117,817.
October 27, 2025 – Beat-Boxer
NEXZ released Beat-Boxer, which included “Next To Me,” one of the group’s songs for which Seita is credited as a lyricist.
February 18, 2026 – First No. 1 music-video release ranking
The filmed NEXZ LIVE TOUR 2025 “One Bite” in Nippon Budokan release topped Oricon’s weekly music DVD/Blu-ray ranking, according to Sony Music’s official profile.
April 27, 2026 – Mmchk
NEXZ released Mmchk, its second single album.
May 6, 2026 – First music-show win
“Mmchk” gave NEXZ its first-ever music-show trophy on MBC M’s Show Champion. Soompi reported that the group won against nominees including PLAVE, TWS, TXT and Hwasa.
May–June 2026 – First arena tour
NEXZ held its first arena tour, NEXZ LIVE TOUR 2026 “Hellmate,” at Tokyo’s Yoyogi National Stadium First Gymnasium and Osaka-Jo Hall.
June 24, 2026 – Hellmate
The group released its third Japanese EP, Hellmate. Billboard Japan reported that it sold 112,082 copies in its first chart week and ranked No. 2 on the weekly Top Albums Sales chart.
August 24, 2026 – SAUCIN’
NEXZ released its fourth mini album SAUCIN’, the latest Korean release included in its official discography.
September 2026 – First Asia Tour announced
JYP announced NEXZ 1ST ASIA TOUR “SAUCIN’ THE WORLD.” The tour opens with two Seoul concerts on October 17 and 18, 2026.
Awards and Achievements
Most awards listed below belong to NEXZ as a group, rather than Seita individually.
| Year | Award / Achievement | Work | Result |
|---|---|---|---|
| 2024 | The Fact Music Awards | NEXZ | Hottest Award |
| 2025 | 39th Japan Gold Disc Awards | NEXZ | Best 5 New Artists |
| 2025 | The Fact Music Awards | NEXZ | Global Hot Trend |
| 2025 | Asia Artist Awards | NEXZ | Best New Artist |
| 2026 | Show Champion | “Mmchk” | 1st music-show win |
| 2025 | Billboard Japan | One Bite | No. 1 Top Albums Sales |
| 2026 | Oricon | One Bite in Nippon Budokan video release | No. 1 weekly music DVD/Blu-ray |
The 2025 Gold Disc recognition is confirmed by the Japan Gold Disc Awards’ official site.
NEXZ’s 2025 Global Hot Trend award at The Fact Music Awards is documented by Soompi and The Fact’s official material.
At the 2025 Asia Artist Awards, NEXZ won Best New Artist, alongside AHOF and KickFlip.
NEXZ’s First Music-Show Win and Why It Matters for Seita
The May 6, 2026 Show Champion win deserves separate attention because it was NEXZ’s first music-show trophy.
It came almost two years after the group’s Korean debut and after several releases that had already built stronger album performance. The win therefore represents a different type of milestone from an album chart result: it shows NEXZ converting its growing physical-market momentum into a televised music-show victory.
For Seita, it is another important group milestone rather than an individual award. His career remains closely tied to NEXZ’s seven-member development.
Touring and Concert History
Seita’s public performance career has expanded alongside NEXZ.
NEXZ SHOWCASE 2024 “Ride the Vibe”
The first Japanese showcase tour covered three cities and six performances, all of which sold out, with approximately 40,000 people attending across the run.
NEXZ LIVE TOUR 2025 “One Bite”
NEXZ’s first nationwide Japanese live tour ran across 15 cities and 18 performances, attracting more than 50,000 attendees, according to Sony Music’s official profile.
Nippon Budokan
The 2025 tour included NEXZ’s first Nippon Budokan performances, which were later issued as a live video release in February 2026.
NEXZ LIVE TOUR 2026 “Hellmate”
The group’s first arena tour took place in Tokyo and Osaka in May and June 2026.
SAUCIN’ THE WORLD
In September 2026, NEXZ announced its first Asian tour, opening at Seoul Olympic Hall on October 17 and 18, 2026.
Brand Endorsements and Ambassadorships
There is no sufficiently comprehensive official record showing Seita holding a major individual long-term brand ambassadorship as of September 2026.
NEXZ has appeared in fashion and promotional features, including the group’s 2024 25ans feature wearing Ralph Lauren’s Fall 2024 collection, but that should not automatically be called an individual Seita endorsement or ambassador appointment.
Verified individual ambassador status: This information is not publicly available.
That distinction matters because magazine appearances, campaigns, event attendance and official ambassador appointments are different types of commercial activity.
Social Media and Official Online Presence
Seita does not appear to maintain a separately verified public social-media account under his own name that is clearly established as an official individual account.
The safest official channels for following Seita are therefore the group’s accounts and websites.
| Platform | Official Presence |
|---|---|
| NEXZ official group account | |
| X / Twitter | @NEXZ_official |
| TikTok | NEXZ official group account |
| YouTube | NEXZ official channel |
| Weverse | No individual Seita account verified here |
| Official Website | NEXZ official website |
NEXZ’s official X account is clearly identified as @NEXZ_official, and the group’s official websites publish member, release and schedule information.
Seita’s Revenue Sources
There is no trustworthy public figure for Seita’s personal earnings or net worth.
Potential revenue categories connected to his professional activity include:
- Group music releases
- Physical album sales
- Streaming
- Concerts and tours
- Merchandise
- Fan events
- Promotional appearances
- Licensing and music-related royalties
- Songwriting/lyric credits where applicable
The existence of those activities does not provide enough evidence to calculate Seita’s private income.
Seita Net Worth
The member’s exact net worth is not publicly available.
Unverified celebrity-net-worth websites should not be treated as financial evidence.
Music Style and Artistic Development
Seita’s most clearly documented musical identity is his role as a rapper/vocalist rather than as a single-purpose specialist.
NEXZ’s catalog also gives him a wider artistic environment than a conventional rap-only role. The group’s music has moved through energetic hip-hop-influenced tracks, brighter pop material, Japanese-language releases and more concept-driven mini albums.
The writing credit on “Next To Me” is particularly useful evidence of Seita’s development. He was credited with lyrics on the song, making songwriting part of the documented side of his career.
NEXZ’s own release history supports the idea that the group has deliberately avoided being locked into one sound. O-RLY? was described by Soompi as built around hip-hop rhythms and the group’s free-spirited identity, while SAUCIN’ is the latest phase of the group’s deliberately playful and flexible concept.
For Seita, this variety creates room to move between rhythmic rap passages, vocal lines and visual-performance moments.
20 Interesting Facts About Seita
- Seita was born on November 28, 2006.
- He is from Saitama, Japan.
- His reported birth name is Kawashima Seita.
- He is Japanese.
- His blood type is A.
- He finished seventh in Nizi Project Season 2.
- He was the final NEXZ member revealed during the debut announcement.
- His individual-level mission featured Stray Kids’ “CASE 143.”
- His early Nizi Project dance ranking was 17th.
- His vocal evaluation ranking in the Japanese camp was sixth.
- He improved to fourth in a later Korean-stage team evaluation.
- His established NEXZ roles are rapper and vocalist.
- He has a documented lyric-writing credit on “Next To Me.”
- He enjoys reading books.
- He has said he likes gaming and drawing during his personal time.
- Waffles are among the foods he has singled out as a favorite.
- He has publicly talked about having an interest in fashion.
- He has described himself as wanting to be admired for both artistry and character.
- He has discussed a preference for quiet time by himself.
- He is part of the NEXZ lineup that entered its first Asian-tour era in 2026.
Frequently Asked Questions About Seita
Who is Seita from NEXZ?
Seita is a Japanese singer and member of JYP Entertainment’s seven-member group NEXZ. He was born November 28, 2006, in Saitama and ranked seventh in Nizi Project Season 2.
How old is Seita in 2026?
Seita is 19 years old as of September 12, 2026. He turns 20 on November 28, 2026.
When is Seita’s birthday?
Seita’s birthday is November 28, 2006.
Where was Seita born?
Seita was born in Saitama, Japan.
What is Seita’s real name?
His birth name is reported as Kawashima Seita (河嶋星太).
What is Seita’s position in NEXZ?
Established profile sources identify Seita as a rapper and vocalist.
What is Seita’s Nizi Project ranking?
Seita finished 7th in Nizi Project Season 2.
When did Seita debut?
Seita debuted with NEXZ on May 20, 2024, when Ride the Vibe was released.
What agency is Seita under?
Seita is a member of NEXZ, whose management is associated with JYP Entertainment, with Sony Music involved in the group’s Japanese activities.
What is Seita’s blood type?
Seita’s blood type is A.
What is Seita’s zodiac sign?
Seita is a Sagittarius because he was born on November 28.
What is Seita’s MBTI?
Older profiles listed INFJ and ISFJ, while updated profile sources report ISTJ. Because his type has changed, older profiles should not be treated as his current MBTI without qualification.
What is Seita’s height?
Seita’s height is not publicly confirmed in a reliable current official source.
What is Seita’s weight?
Seita’s weight is not publicly confirmed in a reliable current official source.
Does Seita write songs?
Yes. Seita received a lyric-writing credit for NEXZ’s “Next To Me,” released on Beat-Boxer.
What is Seita’s favorite food?
In a ViVi interview, Seita highlighted waffles and said he also likes rounded foods such as hamburgers and doughnuts.
Does Seita have an official solo Instagram account?
No separate verified individual account is reliably established in the official sources reviewed. The safest official social presence is through NEXZ’s group accounts.
Is Seita dating anyone?
There is no publicly confirmed relationship information from a reliable agency or major publication.
What is Seita’s net worth?
Seita’s exact personal net worth is not publicly available. Published figures from unverified celebrity-net-worth sites should not be treated as confirmed financial information.
Conclusion
Seita’s story is one of gradual development rather than instant top-ranking success. He entered the final stages of Nizi Project Season 2 outside the leading positions, improved during the Korean evaluations and ultimately secured the seventh and final place in NEXZ.
Since NEXZ’s May 2024 debut, he has developed as a rapper and vocalist while also gaining a documented lyric-writing credit on “Next To Me.” His interests in reading, drawing, gaming and fashion add context to his public image, while his Nizi Project history remains an important part of how fans understand his rise to debut.
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