Shikorae

Shikorae or also known as Rio is a very recurring antagonist who appeared in Tokyo Ghoul: Re. He is Ghoul and a member of the Clowns, he was previously associated with Aogiri Tree. And before becoming a member of Aogiri, Shikorae was an orphan who was trapped in Cochlea and after the Jail Incident and the death of his brother. Although he was dangerous when he gets up, but he was very weak and often he was easily defeated by his enemies. However all that changes when Shikorae gains a kakuja for devouring Dragon's remains, turning into mutant ghoul with a monstrous appearance.

Rosewald Investigation
Shikorae first appeared during an attack on Quinx Squad by a group of Aogiri members hired Karren von Rosewald where he ambushed a distracted Saiko Yonebayashi and pinned her to the ground. He finds her hidden and comments on how clubby she is after he arrests her and decides to fast on her. He then starts with her arm until a mysteryous Robet Giant appears and attacks him with his ukaku kagune and injures him. So with that Shikorae is bound to retreat.

Tsukiyama Family Extermination Operation
Shikorae appears in an attack led by Naki where Aogiri members attack a CCG Transport and steal Ginshi Shirazu's body for Kanou's experiments.

Trivia

 * In the game called Tokyo Ghoul Jail where the main protagonist is Rio, and in this altenative story Rio would go out on Cochlea and meet Kaneki and join Anteiku.