@riot skin design- I dont have an exact, but these 3 skins would be awesome
All 4 of these skins would have a DJ sona like effect while in their ult (or in Gnars case upon transformation. changing the music, if you can see them to a boss battle theme. If they die in boss form, the enemy team would get the happy music (kinda like what FF series does when you win a fight)
final boss 
final boss 
final boss 
final boss
-ok this one I could see transforming into a Ridley from Metroid resembling dragon