Utsugi Uyu is a male Japanese Virtual YouTuber associated with HOLOSTARS, debuting under the unit UPROAR!! alongside Yatogami Fuma, Hizaki Gamma and Minase Rio. Uyu, along with the rest of UPROAR!!, were introduced on 19 March 2022 (JST), during the hololive SUPER EXPO 2022 event, though their social media accounts were not revealed until 22 March. His YouTube channel has a creation date of 7 February 2022, while his Twitter account was also created in February 2022. During the day, Uyu runs a coffee shop which was inherited from his grandfather and while at night he's a phantom thief. Unlike the rest of his unit members, Uyu wasn't shown as a silhouette in the first teaser for the unit.
The phantom thief infatuated with beauty. Rumor has it "there are treasures only an idol can obtain". He is becoming an idol to get his hands on these treasures.