U of OURBIRTHDAY: Member Profile and 2026 Guide

Japan member born August 21, 2008; rapper and performer and Side B debut performer.

Bottom line

U is an active OURBIRTHDAY member from Japan, born August 21, 2008. She is documented as the rapper and performer, entered the rollout through Side B, and officially debuted with all seven members on August 19, 2026.

U is being documented at the start of a career, so chronology matters more than filler. The page marks what is confirmed, what is interpretation and what still needs future evidence.

Quick facts

Stage name: U. Birthday: August 21, 2008. Nationality: Japan. Group: OURBIRTHDAY. Label: INNIT Entertainment. Debut unit: Side B. Role: rapper and performer. WHIP! avatar: Tirumico. Representative color: yellow. Representative motif: spark.

U is being documented at the start of a career, so chronology matters more than filler. The page marks what is confirmed, what is interpretation and what still needs future evidence.

Before OURBIRTHDAY

Universe Ticket and THE DDANDDARA finalist, previously promoted as Yu. That history matters because it explains why some viewers recognized her before the group name existed. It does not give permission to turn old edits, rankings or fan assumptions into a permanent personality diagnosis.

U is being documented at the start of a career, so chronology matters more than filler. The page marks what is confirmed, what is interpretation and what still needs future evidence.

The reveal sequence

U entered public OURBIRTHDAY chronology through Side B. Side A arrived July 22 with Hyejin, Baby and Achiraya; Side B arrived July 29 with U, Hyewon, Chorok and Kilala. The official seven-member debut followed August 19.

U is being documented at the start of a career, so chronology matters more than filler. The page marks what is confirmed, what is interpretation and what still needs future evidence.

HUNGRY participation

U appears in “HUNGRY (Side B)” with U, Shin Hyewon, Kuk Chorok and Kilala. This page does not attach her to the Side A React simply because both performance videos share the HUNGRY title.

U is being documented at the start of a career, so chronology matters more than filler. The page marks what is confirmed, what is interpretation and what still needs future evidence.

SQUEEZY and official debut

“SQUEEZY” is the first full-group title track and the cleanest professional starting line for U. Its funk base and stress-release metaphor ask for bounce, timing and readable character rather than the bluntest possible impact.

U is being documented at the start of a career, so chronology matters more than filler. The page marks what is confirmed, what is interpretation and what still needs future evidence.

Performance identity

rapper and performer is a useful starting coordinate for U, not a substitute for watching her work. The responsible question is how she handles timing, line handoffs, expression and formation pressure across HUNGRY and SQUEEZY—not whether a label can rank her against six teammates.

U is being documented at the start of a career, so chronology matters more than filler. The page marks what is confirmed, what is interpretation and what still needs future evidence.

The first single album

The debut single preserves both HUNGRY units beside “Our Birthday” and “SQUEEZY.” That track list lets U belong to a complete seven-member project while still keeping her exact unit participation discoverable.

U is being documented at the start of a career, so chronology matters more than filler. The page marks what is confirmed, what is interpretation and what still needs future evidence.

One person, one canonical page

This is U’s only biography on CVM Sekai. If she later releases verified original solo work, Artist discovery will route here rather than creating a duplicate page. Covers, dance clips and survival stages are documented work but not automatically an independent debut.

U is being documented at the start of a career, so chronology matters more than filler. The page marks what is confirmed, what is interpretation and what still needs future evidence.

Names, search and translation

New groups accumulate conflicting romanizations quickly. This file uses the stage name printed in the official rollout and keeps group context in the title where needed for search clarity. A one-letter name such as U especially requires that discipline; clarity is not a rebrand.

U is being documented at the start of a career, so chronology matters more than filler. The page marks what is confirmed, what is interpretation and what still needs future evidence.

Public persona boundary

The Tirumico avatar, yellow color and spark motif are promotional identity tools. They can help fans navigate the debut world, but they are not clinical evidence or a map of private character. This profile analyzes observable public work and leaves invented intimacy outside.

U is being documented at the start of a career, so chronology matters more than filler. The page marks what is confirmed, what is interpretation and what still needs future evidence.

International fan guide

Follow the official OURBIRTHDAY FANS community, YouTube channel and dated release pages first. When translations disagree, preserve the original source date and avoid upgrading an unsourced fan detail into fact merely because multiple databases copied it.

U is being documented at the start of a career, so chronology matters more than filler. The page marks what is confirmed, what is interpretation and what still needs future evidence.

RaeRae take

U does not need a manufactured superlative this early. The interesting question is what remains recognizable after the debut concept stops doing introductions for her. Side B supplied the first evidence; SQUEEZY starts the longer test.

U is being documented at the start of a career, so chronology matters more than filler. The page marks what is confirmed, what is interpretation and what still needs future evidence.

What to watch next

Watch future line distribution, dance breaks, writing credits, variety appearances and any verified individual original release. This page will expand from evidence without pretending a rookie’s first month is already a finished biography.

U is being documented at the start of a career, so chronology matters more than filler. The page marks what is confirmed, what is interpretation and what still needs future evidence.

Archive accountability

The profile records confirmed group status as of August 28, 2026. There are no departure notices or hiatus labels attached to U. Changes require durable official evidence, not silence between schedules or a fan-made lineup graphic.

U is being documented at the start of a career, so chronology matters more than filler. The page marks what is confirmed, what is interpretation and what still needs future evidence.

HUNGRY (Side A) React image card

HUNGRY (Side A) — exact-video in-depth React

Official-video tracker

https://www.youtube.com/watch?v=pVrTAE6oOPY

HUNGRY (Side A) — official performance video and CVM React source

Side A belongs to Cho Hyejin, Baby and Achiraya. Exact upload ID: pVrTAE6oOPY.

https://www.youtube.com/watch?v=kzJEU04iXDU

HUNGRY (Side B) — broadcast performance reference

Side B belongs to U, Shin Hyewon, Kuk Chorok and Kilala. The archive keeps unit participation explicit instead of treating both versions as one interchangeable clip.

The first single album Our Birthday arrived August 19, 2026 with “Our Birthday,” “SQUEEZY,” “HUNGRY (Side A)” and “HUNGRY (Side B).” Future official uploads belong here with exact IDs and release dates.