it would seem like an obvious choice. but im guessing since he recently gotten a skin they'll wait till next year!
Definitely not Gnar with him pretending to be tibbers would be nice since tibbers already looks like a nice suit and swings when attacking
Since the splash on PBE for Riven/Blitz's new skins show the 5-man teams, and that the arcade skins already have a top (
) and jungle (
), Mini Boss Gnar would be pretty sweet.
My predictions for the skin lines:
Arcade:
(
or
)
Boss:
(
or
)

along with plumber
or
who wears a red cap.
They missed a great oppurtinty to have a
arcade......the dude wouldve been a great boss battle skin.