In general, Chuya comes off as an irritable and arrogant character, especially around Osamu Dazai, his former partner turned enemy and rival. He frequently smirks while in combat and is the type to criticize his opponents during combat. Chuuya is a temperamental executive in Port Mafia, so he has a lot of sources for stress. When factoring in Dazai and his hatred at the sight of him, that triples his anger and stress.