Old guy is old, Soifon is dangerous to be around, Gin is creepy, Unohana is scary, Aizen is evil, Byakuya has a stick really rammed in there, Tousen is Tousen, and Mayuri is Mayuri. Don't see much in the way of lulz from Ukitake (More annoyance from his subordinates) nor Komamura, Kenpachi is Kenpachi, so really I'm left with Hitsugaya or Kyoruaku, both of whom take part in antics and interactions with their vice captains amuse me.