I ban Michael 'cos, ah, that Executor dude from first Starcraft.
(The Executor from Brood War was implied to be Selendis, but not confirmed).
Well, it's just for me most characters from LotV seem to be bland, plain and very forgettable, except for Karax and Alarak. Same applies to some other characters from the 'verse itself. It would apply to Raynor, Kerrigan and Zeratul if they weren't flakking everywhere.