Nice link choice there.Flour said:"BFG syndrome" is a horrible name IMO but while there is no kill like overkill [http://tvtropes.org/pmwiki/pmwiki.php/Main/ThereIsNoKillLikeOverkill], I prefer cherry tapping over using an RPG to kill a mouse.
Most of the obvious ones have already been mentioned.
If we weren't restricted to game characters then I'd say anyone from Tengen Toppa Gurren Lagann would count.
Oh, and can't forget this guy: