I sense a running gag in minami's work. Class president appears to be in league with Luka.

Luka's closer to Minami of Lucky Star or Sakaki of Azumanga Daioh.

This particular characters seems to be some sort of fusion of that archetype, the class rep archetype, and, I dunno, tsundere?

don't forget the sakuya-nosebleed archetype :P