i'll think of a few harmless pranks that kokichi might do and get back to you on that! c:

and LAUGHS god i love that. yuuki is literally the only person who thinks her brother isn't a jerk so i'm sure some incorrect impressions can be made. asami can just come in and find kokichi in his super casual clothes, chilling on the couch with some video game, and he just yells back: "hey, yukki!! you brought home a wet blanket! what gives!"