Here's a style/theme I thought of for Rumble characters, Elemental Characters!
Flame🔥, Aqua💧, Wind🌪️, Quake⛰️, Frost❄️, Plant🌿 and Thunder⚡.
Maybe they wear alternate clothing, but like the chrome or jewel characters, their entire body adapted to the element.
Man, this idea is dangerous. They'll keep making skin for existing characters based on this instead of adding new SEGA classic characters.