Azusa describes him as big, 'super' tall and 'musely'. He wears a black suit and scary sunglasses, not fitting into the mental hospital at all according to Azusa.
He first appears in chapter 17 where Azusa walks into him and spills her glass of water all over her top. She's intimidated when she sees how he's towering above her. He yells at her before Masahiko takes care of the situation.
The next time he is seen in chapter 37 in a side alley.
- His return in chapter 37 might be related to the fact that he was kind of popular with some fans