sasuke. DEFINTELY sasuke.
Ouro Banchou's team, from Kongou Banchou. I mean, sure, they beat up one of the Dark Student Council members, but they never really lived up to being any more than hyped fodder to me. It was a shame, too...their powers and personalities looked like they would've been quite the contrast to Kongou's friends.
Also, Haiji, from Hungry Joker. His powers and characterization were growing at a nice, steady, eveny paced rate, while the manga was in its early stages. But once it got towards the (forced, tragic) end, Haiji's transformation, both in power and in character, seem so...rushed. Bumped ahead. Like, he just skipped straght from point D to point Z, withoutbso much as a proper warning...he could've been so much more defined.