Majuu-ou

Majuu-ou is a side-scrolling platformer for the Super Nintendo that has influences from Castlevania and Contra. You play the role of Abel, who wants to free his daughter from the depths of hell. When you defeat certain bosses, they drop large, color-changing gems. When you pick up the gem, you turn into either a red harpy, a blue dragon, or a green lizard, depending on what color it is when you pick it up. Each type of demon has its own special attacks.