Shit, I honestly thought the OP's pic was Shadow the Hedgehog. Like, actually. Look at all that edge.
That said, I've always liked Lucario from a gameplay standpoint. It has great stats, a great movepool, and a pretty good typing. It's a shame that Lucario is now associated with just negative things though, so I don't mention liking it too often. I'll use it if I can, ingame or competitively, though.