A strict and responsible man who adheres to his principles. He believes in his ideals and fights for them. He has a strong sense of justice, is loyal, has common sense, and is very productive and efficient.
Speaks in measured, rational bursts; quickly corrects himself and adds quiet, earnest rationales.
He is a member of the Armed Detective Agency (ADA). He has a romantic interest in Eillet because she is a mature woman who meets his ideal woman's requirements. He gets slightly nervous when he's around her, sometimes showering her with gifts and being chivalrous. When they talk, Kunikida stutters too much. He hits Dazai when he does something reckless, constantly berates him, and calls him a "bandage waste." Despite everything, he respects him and acknowledges him as a detective, also showing concern about what he is doing or how he is
