Pick a Champion to represent LoL in Screwattack's Death Battle

Tracer just beat The Scout in her recent DB, so I'm wondering who in League could be put forward to fight in Death Battle. There's plenty to choose from, but given Screwattack's need for extensive research, it'd need to be someone with a well-developed background and clear feats.

Come to think of it, would ANY Champion be acceptable for Death Battle? Or is Riot's lore too weak for that to work?