Kou is cheerful, direct and tends to jump into things headfirst without properly thinking them through.

He is often misjudged as a bit of a delinquent or rude, but this is actually not the case. He is rash and loud but is also simultaneously very kind and caring. He makes a distinct effort to be polite, as seen when even though he was about to face off with Hanako upon their first meeting, he still took the time to be polite to Nene and warn her about the perceived danger.

Kou has a strong sense of justice, and was also kind and open-minded enough to revise his opinion on Hanako and become friends with him, despite the pressure from his older brother to exorcise the ghost and the brothers' long-held belief that all supernaturals are bad.

He is very loyal to his friends and helps them in any way he can, no matter the danger. He is also easily flustered and sometimes makes mistakes due to rushing into things too quickly.