Go Mario and Sonic!
The fight scenes are like Sonic's Quest For Power (except that they don't cause seizures), and Super Sonic and invincible mario fighting together was awesome beyond belief! R.I.P., Koopa Bros and Axem rangers, we will always remember you for you're exaggerated weapons, comic relief, and...yeah, that's about it! I think I've figured out the characters:
Mario: Goku
Sonic: Trunks
Shadow: Vegeta
Luigi: Kuerin
Wario: Multiple roles (Hercule combined with that one guy in the fillers that is constantly seen with the Krane Hermit)
Robotnik: Dr. Gero
Bower: Freeza
Metal Sonic: Cell/The Androids
And to close, it's good to see Mario and Sonic fighting together instead of fighting for stupid reasons! I'd love to see Mario and Sonic do a fusion technique! Update soon!