Sōsuke Aizen
Hitsugaya lived with his grandmother and with Momo Hinamori, whom he considers a very close friend. Hitsugaya excelled in the Soul Reaper academy, becoming the youngest captain in the history of Soul Society with command over Squad 10. Introduced to the Gotei 13, Hitsugaya suspected Squad 3 captain Gin Ichimaru of foul play as the circumstances surrounding the coming execution of Rukia Kuchiki become more complicated. When Hinamori is manipulated into thinking that Hitsugaya killed Sōsuke Aizen, Hitsugaya attacks Gin on the notion that he tricked her. The fight is interrupted when Hitsugaya dodges an attack that almost kills Hinamori, only to be intercepted by his lieutenant Rangiku Matsumoto. Seeing how destructive Rukia's execution is becoming, Hitsugaya tries to stop it by appealing to the Chamber 46, only to discover all members were murdered by Aizen, who faked his death. When Hitsugaya discovers Hinamori injured, Hitsugaya tries to kill Aizen but is defeated.