ONE N’ ONLY Members Profile and Facts:
ONE N’ ONLY is a five-member Japanese boy group under Stardust, consisting of Hayato, Rei, Tetta, Naoya, and Eiku. The group was formed following a joint tour between EBiSSH and SBC in April 2018. They officially debuted on May 7, 2018, with their first single, “I’M SWAG.” Kenshin departed from the group on March 4, 2025.
Group Name Meaning: ONE N’ ONLY’s name signifies their uniqueness and irreplaceability, representing a fusion of individuality and unity that defines their distinct artistic identity.
Official Greeting: “We are ONE N’ ONLY!”
(said together with a hand gesture, often pointing upward to symbolize unity).
ONE N’ ONLY Official Fandom Name: SWAG
ONE N’ ONLY Official Color: White
ONE N’ ONLY Official Logo:
Official SNS:
Website: one-n-only.jp
Blog: ameblo.jp/onenonly-blog
Instagram: @onenonly_tokyo
X: @onenonly_tokyo
TikTok: @onenonly_tokyo
YouTube: ONE N’ ONLY TV
Facebook: ONE N’ ONLY
LINE: ONE N’ ONLY
Weverse: ONE N’ ONLY
Spotify: One N’ Only
ONE N’ ONLY Member Profiles:
Hayato
Stage Name: Hayato (颯斗)
Birth Name: Takao Hayato (高尾颯斗)
Position(s): Leader, Rapper, Dancer, Actor
Birthday: September 17th, 1999
Zodiac Sign: Virgo
Height: 175.8 cm (5’9 1/4″)
Blood Type: AB
MBTI Type: ENFJ
Nationality: Japanese
Instagram: @8810_takaofficial
TikTok: @hayato_ekradio_fy
Hayato Facts:
– He was born in Shizuoka Prefecture, Japan.
– Hobbies: Eating and searching for sour foods, finding out about UMA (Unidentified Organisms).
– His brother is Fumiya of BUDDiiS.
– His special skills are dancing and playing soccer.
– He studied dancing for more than 15 years.
– He’s also good at making choreography.
– Hayato says that he was afraid of dying, because he had never done it before.
– He is a member of Satori Boys Club (SBC).
– Hayato has been hosting a radio show on TOKYO FM since 2019.
– He has starred in the movies “Battle King!!: We’ll Rise Again“, Japanese TV “FAKE MOTION: Tatta Hitotsu no Negai “, and “A Seaside Weekly Tabloid“.
– He will be starring in the movie “Battle King!! Map of the Mind Part 1” as the main role of Naoe Ainosuke, expected to be released in 2025 with the other members.
Rei
Stage Name: Rei (玲)
Birth Name: Sawamura Rei (沢村玲)
Position: Vocalist, Actor
Birthday: January 2nd, 1997
Zodiac Sign: Capricorn
Height: 177 cm (5’10”)
Blood Type: B
MBTI Type: ENFP
Nationality: Japanese
Instagram: @rei.sawamura_official
Personal Blog: #REI
Rei Facts:
– He was born in Shizuoka Prefecture, Japan.
– He is part of EBiSSH.
– His hobbies are cooking, cars, baseball, and collecting earphones.
– His special skills are cooking, eating spicy food, tongue twisters, and playing basketball.
– He and Tetta are DragonBall fans.
– In 2018 he made his drama debut as Arai Souma in “Itsumademo Shiroi Hane“.
– In 2021 he starred in “FAKE MOTION: Tatta Hitotsu no Negai” as Amakasu Shintaro.
– In 2024 he starred in several dramas including “Happy of the End” as Keito/Haoran, “Anti-Hero” as Morio, “Kare no Iru Seikatsu” as Haruna Keita, and “Patisserie Mon” as Shibata.
– He has also starred in the movie “Battle King!!: We’ll Rise Again” as Saotome Izou.
– He along with the other members will be starring in the 2025 movie “Battle King!! Map of the Mind Part 1“.
Tetta
Stage Name: Tetta
Birth Name: Seki Tetta (関哲汰)
Position: Vocalist, Actor
Birthday: November 24th, 1997
Zodiac Sign: Sagittarius
Height: 169 cm (5’7″)
Blood Type: B
MBTI Type: ENFP
Nationality: Japanese
Instagram: @tetta1124_official
Personal Blog: #TETTA
Tetta Facts:
– He was born in Kanagawa, Japan.
– He is a member of EBiSSH.
– His hobbies are watching movies, billiards, karaoke (which he’s a vip member of), and shopping.
– His talents are painting, hair styling, hand-pushed sumo, and impersonations.
– He and Rei are DragonBall fans.
– He along with the other members starred in the 2023 movie “Battle King!!: We’ll Rise Again” as Sanada Shinsaku.
– He also starred in the 2024 movie “100 Byo no Keno: Kenka Battle Royale” as Washida Ryu.
– He will be in the upcoming 2025 movie “Battle King!! Map of the Mind Part 1“.
– In 2017 he made his acting debut with a small guest role of Daichi [Customer of Tsukumodo] in the drama “Sakura no Oyakodon“.
– In 2019 he had a small guest role in episode 1 of “JOKERxFACE“.
– In 2021 he landed his first supporting role in the drama “FAKE MOTION: Tatta Hitotsu no Negai” as Yamaura Takayuki.
– In 2024 he also appeared in the dramas “Patisserie Mon” and “Mars: Zero no Kakumei“.
Naoya
Stage Name: Naoya (直弥)
Birth Name: Kusakawa Naoya (草川直弥)
Position: Rapper, Dancer, Actor
Birthday: April 6th, 1998
Zodiac Sign: Aries
Height: 175 cm (5’9″)
Blood Type: A
MBTI Type: ESFJ
Nationality: Japanese
Instagram: @0406_k.naofficial
Personal Blog: NAOYA
Naoya Facts:
– He was born in Tokyo, Japan.
– Naoya has a brother Takuya of Choutokkyuu.
– He played soccer (For 11 years)
– His hobbies are shopping and fashion coordination.
– His special skills are soccer (he played it for 11 years), vaulting box, and finger push-ups.
– He is part of EBiSSH.
– In 2016 he made his acting debut in the movie “Valentine Nightmare” as Aizawa Taro.
– He appeared in the films “Midori no Zawameki” (2023) as Sotaro, “Battle King!!: We’ll Rise Again” (2023) as Kai Genbu, “The Sunday Runoff” (2022) as Hara, and “The Badly-Bruised Devil” (2017) as a classmate, all in support roles.
– He appeared in the dramas “Shiosuke to Amami: Soba ga Dekiru Made Tantei” (2022) as a high school student (Guest Role), “FAKE MOTION: Tatta Hitotsu no Negai” (2021) as Akechi Jubei (Support Role), “High&Low: The Worst Episode.O” (2019) as Shimoda (Support Role), and “His – Koisuru Tsumori Nante Nakatta” (2019) as Igawa Shun (Main Role).
– Along with the other members he will be in the 2025 movie “Battle King!! Map of the Mind Part 1“.
Eiku
Stage Name: Eiku (永玖)
Birth Name: Yamashita Eiku (山下永玖)
Position(s): Vocalist, Maknae, Actor
Birthday: December 19th, 1999
Zodiac Sign: Sagittarius
Height: 169.1 cm (5’6″)
Blood Type: B
MBTI Type: ESFP
Nationality: Japanese
Instagram: @eiku1219_official
Personal Blog: #EIKU
Eiku Facts:
– He was born in Yamanashi Prefecture, Japan.
– His hobbies are playing musical instruments / music, basketball, soccer, gymnastics, games.
– His special abilities are dancing, playing the drums, piano and guitar.
– He is a member of Satori Boys Club (SBC).
– He started playing drums at the age of 6, guitar and bass at the age of 10.
– He writes his own lyrics and music.
– He has the best motor skills in the group, and can do backflips just by watching a video.
– He is also very naive, and often misreads, mispronounces, and remembers kanji characters, surprising those around him.
– He has a baby face and is often mistaken as a middle school student.
– Eiku made his acting debut as a supporting role in the 2017 movie “The Badly-Bruised Devil“.
– Landed his first role in the 2018 drama “Shufu Katsu!” as Makihara Hiroki (Ep. 7).
– He has also starred in the 2018 movie “A Seaside Weekly Tabloid” and the 2023 movie “Battle King!!: We’ll Rise Again” as Kousaka Genjiro.
– He appeared in the dramas “Ayaka-chan wa Hiroko-senpai ni Koishiteru” (2024) as Kumagai Ryo (Support Role), “Patisserie Mon” (2024) as Mishima (Guest Role), “Socho Shihatsu no Sappukei” (2022) as Narita (Guest Role), “FAKE MOTION: Tatta Hitotsu no Negai” (2021) as Naoe Tomohiro (Support Role), and “Sorezore no Dangai” (2019) in a guest role.
– He will be in the upcoming 2025 movie “Battle King!! Map of the Mind Part 1“.
Former Members:
Kohki
Stage Name: Kohki (幸輝)
Birth Name: Hayashi Kōki (林幸輝)
Position(s): Vocalist, Dancer
Birthday: January 15th, 1999
Zodiac Sign: Capricorn
Height: 180 cm (5’11”)
Blood Type: AB
MBTI Type: N/A
Nationality: Japanese
Kohki Facts:
– He was born in Chiba, Japan.
– He was also part of EBiSSH.
– His hobbies are playing games, and watching TV.
– His talent is swimming.
– He left ONE N’ ONLY and EBiSSH in December 2019 in order to focus on his studies.
Kenshin
Stage Name: Kenshin (謙信)
Birth Name: Kamimura Kenshin (上村謙信)
Position(s): Rapper, Dancer
Birthday: July 8th, 1999
Zodiac Sign: Cancer
Height: 178 cm (5’10″)
Blood Type: B
MBTI Type: ESFP
Nationality: Japanese
Instagram: @kenshin_stagram0708
X: @kenshin110708
TikTok: @kenshin199978
Personal Blog: #KENSHIN
Kenshin Facts:
– He was born in Aichi Prefecture, Japan.
– His hobbies are watching sumo games, comedy and variety, also trying spicy gourmet food.
– His special sills are dancing, swimming, and skiing.
– He’s a huge Michael Jackson fan and started dancing because of him.
– He is a member of Satori Boys Club (SBC).
– He has a driver’s license.
– He is a Sauna Spa health advisor and is currently studying for his “Sauna Spa Professional” license.
– He is also a fan of comedy, and his own segment, “K Studio,” where he invites comedians for discussions, is currently airing to great acclaim on the group’s regular radio show, AuDee’s “One N Time.”
– Made his acting debut in the 2018 drama “Shufu Katsu!” and the movie “A Seaside Weekly Tabloid” both were guest roles.
– Landed his first supporting role in the 2021 drama “FAKE MOTION: Tatta Hitotsu no Negai” as Kakizaki Jin.
– Starred in the movie “Battle King!!: We’ll Rise Again” as Kurama Kenichiro in 2023.
– Recently starred in the 2024 drama “Ossan’s Love Returns” as Hao.
– He will be in the upcoming 2025 movie “Battle King!! Map of the Mind Part 1“.
– Kenshin officially left the group and the agency on March 4, 2025. (source)
– Regarding his leave, Stardust Promotion announced they have terminated their management contract with Kenshin, citing “significant compliance violations.”
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Note 2: The current listed positions are taken from their official website.
Made by: LizzieCorn
Edited by: xJenniferx
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Who is your favorite ONE N’ ONLY member? Do you know more facts about them? Feel free to comment below.
