Ruki Shiroiwa
JO1’s Tokyo-born vocalist, songwriter, actor and radio anchor. Ruki combines princely styling with enough practical media experience to keep a live microphone from becoming a threat.
Profile
| Full name | Ruki Shiroiwa (白岩 瑠姫) |
|---|---|
| Born | November 19, 1997 |
| Birthplace | Tokyo, Japan |
| Height | 175 cm |
| Blood type | O |
| Group | JO1 |
| Creative lanes | vocals · songwriting · acting · radio |
| Agency | LAPONE Entertainment |
| Status | Active · 2020–present |
Produce 101 Japan and JO1
Ruki entered Produce 101 Japan with prior idol and performance experience, then earned a place in JO1 through the public vote. That longer road matters: his polish did not arrive overnight, and his role in the group combines stage awareness with the ability to steer conversation.
JO1 debuted in March 2020 with PROTOSTAR and “Infinity.” The group’s scale means every member needs a distinct visual and musical function; Ruki has built his through camera control, melodic songwriting and a growing lead-actor résumé.
Music, performance and credited work
Ruki’s official writing credits include JO1’s “YOLO-konde” and “Bon Voyage,” plus his own “Himawari” and “FOUR SEASONS,” both credited to him for lyrics and composition. His solo releases include “Sunflower” and “Meguriboshi.”
His vocal style favors clear emotional delivery over unnecessary force. In JO1 songs, he is especially useful when a chorus or bridge needs to feel cinematic without losing the pop melody underneath it.
Before Produce 101 Japan
Ruki’s route to JO1 included earlier idol, stage, and entertainment experience rather than a sudden first audition. Those years gave him familiarity with cameras and public presentation, but they also meant carrying previous attempts into a new survival-show format where the final decision belonged to viewers.
On Produce 101 Japan, he had to translate that polish into team usefulness. The program evaluated vocals, dance, leadership, adaptability, and audience connection across changing concepts. Finishing in the debut lineup established JO1 as the successful next chapter rather than erasing the work that came before it.
JO1 performance and media role
Ruki contributes a clear melodic tone and strong camera awareness inside an eleven-member group. His “prince” image is recognizable branding, but the practical value is his ability to hold a live conversation, support broadcasts, and keep a performance readable when the center moves.
Acting and radio work extend that communication skill beyond music stages. Those activities remain part of the same canonical career profile, while film or broadcast appearances do not by themselves create a solo music catalog.
Songwriting and individual releases
Credits on JO1 songs such as “YOLO-konde” and “Bon Voyage” document creative work inside the group. Individually focused songs including “Himawari” and “FOUR SEASONS” show how his writing changes when the emotional frame narrows.
The PLANJ-related solo releases “Sunflower” and “Meguriboshi,” together with his 2025 Who am I? solo-show chapter, establish officially credited individual music. That is the evidence supporting Solo Artist taxonomy alongside continued JO1 membership.
Canonical profile scope
Ruki remains a current JO1 member from 2020 onward and an active solo artist from 2025 onward. JO1 releases remain group work, while principally credited Ruki releases belong to his solo catalog. Both directory classifications point to this one profile rather than duplicate biographies.
Acting, broadcasting and side quests
Ruki starred as Seiji Fukagawa in the 2023 film Yoru ga Aketara, Ichiban ni Kimi ni Ai ni Iku and voiced You in the 2025 animated film AS ONE. His drama credits include a lead Short Program episode and Jun Naruse in Musume no Inochi wo Ubatta Yatsu wo Korosu no wa Tsumi desu ka?.
Since 2022 he has served as the main personality of JO1’s All Night Nippon X, a role that makes his conversational control as important as his stage work. His LAPOSTA 2025 solo show was titled Who am I?.
Fandom notes and useful context
- Radio lane: regular live broadcasting documents his ability to manage pace, guests and group chaos.
- Writer file: “Himawari” and “FOUR SEASONS” carry both lyric and composition credits.
- Tokyo roots: his official profile lists Tokyo as his birthplace.
- Prince image: the nickname survives because he understands styling and posture, but the useful skill underneath it is media fluency.
RaeRae take
Ruki looks like someone booked a prince and then discovered the prince had already prepared the radio rundown. He knows where the camera is, where the conversation is going and exactly how long to wait before making the room laugh.
YouTube tracking history
Official solo releases and member-led videos:
