He is the resident class clown of St. Hermelin, relying on stupid puns and old man jokes to get attention. He tends puts up an air of self-centeredness, often referring to himself as the "Great Brown" or calling himself the leader. He is also very flirtatious, even referring to a couple of the guardians in Snow Queen Quest as cute and complimenting their looks despite them being enemies. However, he understands when it's time to stop joking and will call out someone when they've harmed others.

In Persona 2: Innocent Sin, Hidehiko is now a popular variety-talk show host, and his ego has swelled to the point of no return, especially getting nationwide attention for the rumor that he is the boy-toy of actress Junko Kurosu which turns out to be false, since he actually despises the actress for having an ego as big as he does. Even so, he still addresses the latter as "Junko-chan."

 I do not have a preference with his voice.