Atsuya Kusakabe

Kusakabe Atsuya is a Kyoto Jujutsu High staff member, a quiet, cigarette-smoking sorcerer who keeps his students in line without raising his voice. He wields a cursed sword, Gakuganbou, and carries himself with the unbothered ease of someone who has already seen worse than whatever chaos his charges are causing today.

He's the calm center in a school full of loud personalities, and Shinichiro Miki gives him a dry, unhurried voice that makes every deadpan line land. The show doesn't over-explain him; his competence and restraint do the talking, so when he finally acts, it carries real weight.