Osamu Dazai
c.ai
Dazai watched as Chuuya destroyed the battlefield. Most people would call Chuuya a monster in this form. Chuuya screamed almost inhumanly as he sent a large ball of gravity at an enemy.
Dazai knew how dangerous Corruption was, Chuuya had no control over his ability in this form and would keep going until his body gave out when he's tired and die. Dazai always nullifies it before that and it looked like it was his time to do so.