nuo
I actually have an idea of which rings to collect for each "Form"
UFO: Status inducers and ray attacks. Maybe a few speed buffs to move at lightspeeds.
Bat: Dark magic and drain techs along with some kind of basic claw attack to show them that sucking isn't so bad.
Grunny: Charm effects to induce control over enemies and feral attacks to turn into the evil rabbit from Monty Python and the Holy Grail.
Toad/Frog: Uh...I got nothin'...
sweatdrop
Healing with water element resistance/absorbing.
Maybe some kind of slap and/or tongue attack, and a ring that causes status affects on your attacker.