The mean one?
Specific characters or just in general? If its close in fighting then a Terminator with either Lightning Claws or the Hammer and Shield.
Personalities? The exiled captain from the stories that ran in the early WH Monthly comics.
I know its hard to pick just one.
I was considering those two you picked as well. There are ranged attacks too so they dont have to be limited to just melee guys.
I havent read the comics. Is the exiled captain pretty cool?