This is a bit of a mess.
I would say "Street Fighter II" (SNES) on the condition that you were using a Game Genie for the "use super moves in air" code.
Why?
This completely alters the game. You can suddenly fireball/dragon punch at any time, including out of a fire efferct (say from M. Bison's or Dhalsim's attacks).
Utter madness, plus is you did "super move" out of a fire effect, your character's colors went all screwy.
Fun times.
Otherwise LEGO Star Wars.
[EDIT: Sorry, I got de-railed here. I was thinking "most fun" when the topic is clearly "best game". Bah]