Henshin! The Tokusatsu RPG

From the introduction:

To come up with a character in order to play Henshin!, the first thing you’re going to need is a character concept. This can be incredibly simple or incredibly difficult depending on the person, and sometimes it can take as little as five minutes or as long as an entire day. Your character could be a simple one-liner such as “a former prizefighter that now hunts for adventure”, or it could be a paragraph-upon-paragraph epic that would make even published authors jealous. Either way, your objective is to create a character that is both fun to play and fits in a campaign.