I remembered that breast/butt-expansion platform RPG idea I had (over?) a year ago and drew up some ideas/style concept for it.

Princess in her default form plus some augments she’d get from defeating bosses and taking their chokers.

Default she can only do a butt attack. No expansion.
Fire she can inhale a ton of air (and expand her boobs) to unleash a powerful fire attack. She can also launch much weaker fire balls.
Water gives her access to swimming and she can make her tail bigger for a powerful attack. She has access to similar move to fire where she absorbs a bunch of water for a powerful attack but it’s only available while underwater.
Earth slows her movement, but she gets a more powerful butt attack (with expansion), and can create a earth-y breast shield.