*SPOILER ALERT IF U READ THIS* he has reason to be angry thou. he was the one who has the "true form" i mean wouldnt anyone be kinda mean if everyone hated you?
All righty well seems like anything having to with Tohru-kun or something like that sets Minchi off from Hanasaku Iroha..sometimes I think it's more serious than playful..however even though she is a tsundere. (and sorry no picture..it doesn't seem to want upload right now :>)
Ed (Fullmetal Alchemist) can get pretty angry if you mention something about his height. Tao Ren (Shaman King) also comes to mind... Gotta love those tempers XD