Below is a list of the Power-Ups and their functions:
Bomb Soldier- Wind him up and when he collodes into another characters path, he will detonate and blow up sending your opponent in the air.
Bumper- Place the bumper in the arena and let a character hit it bumping them to another area.
Energy Blade- is like a light saber in Star Wars. Does some heavy damage.
Flame Flower- from Mario games, lets you have flamethrowing power.
Green Shell- goes in the direction you kick it in
Hammer- from classic Donkey Kong, makes you temporarily invincible doing some good damage.
Heart Container- from Zelda/Link Games. Heals all damage.
Home Run Bat- lets your opponents feel how a home run feels. Sends enemies flying.
Maximum Tomato- recovers 100% damage.
Motion Mine- Set on ground. Detonates and blows up when characters are in its range.
Paper Fan- Gives paper cuts.
Pokeball- a random pokemon comes out to do your dirty work for you.
Ray gun- good weapon for shooting from far ranges.
Red Shell- follows nearest character and takes them out.
Star- makes you invincible for a limited time.
Star Wand- like the home run bat but lesser range. If close enough does good damage.