No weapons: Sonic speeds around Luigi at 600 mph and smashes into him with spin dash, effectively cutting Luigi in half. Sonic wins.
Weapons: Luigi uses a star to go invincible, Sonic uses the Chaos Emeralds to go super. Tie.
Luigi because he is more determined. Determination always wins. Sonic takes his fighting as a job, not a "career".
Sonic would win the fight, but sora would put in one hell of a fight.
Sonic
In a fight between Luigi and Bowser Jr, Luigi would most likely win.
sonic
The answer to this is opinionated.
Sonic because he is fast! You need to choose one Pokemon to fight him.
No weapons: Mario and Luigi's only natural abilities are super jumping and the power to shoot fireballs from their hands, while Sonic and Shadow can both run at speeds exceeding 600 mph, and can apparently shred through steel without injuring themselves. Sonic and Shadow win. Weapons: Mario and Lugi use a Star to go invincible, Shadow and Sonic use the Chaos Emeralds to go super. Tie. Super Sonic is a wannabe of Goku.
Sonic. He can turn invincible and fly around.
Hyper sonic.
Dark sonic would win period. Dark sonic can disintegrate anything he looks at. Sonic just turns super sonic and runs and were weolf form, but they are both still pretty good.
Sonic because he can Dodge Spider-Man´s attacks.
Sonic, of course. Freddy only exists in your mind.....