Relevant discussion threads:
Powerups are manifestations of the Kaijujin - designed to make battles more interesting. We plan to have four powerups in the game:
Red Fury Powerups, which increase a character's attack speed, damage, and Ferocity.
Blue Speed Powerups, which increase a character's movement, charge damage, and Agility.
Yellow Energy Powerups, which refill a character's Energy, increase weapon damage, and Power.
Green Strength Powerups, which increase a character's Defense, size, weight, strength, and Fortitude. (They do NOT regenerate health!)