YES, there is a super heroine called "Squirrel Girl" published by Marvel.
You'd think that young Doreen Green's mutant power was Super-Adorability, but her abilities go far beyond simple cuteness. Her semi-prehensile tail allows her to display amazing feats of agility...well, yeah, that tail IS pretty adorable. How about the empathic bond she shares with squirrels? That's a good power! But, yeah, it's also kind of adorable.
Okay! Those enlarged incisors on her pouty little mouth! Those are...awfully, awfully cute.
All right, she may be the cutest thing on two feet (and a tail), but she's single-handedly beaten Dr. Doom, Mandarin, M.O.D.O.K and Thanos. THEY thought she was cute, too...until she kicked their butts!
SQUIRREL Pwr !!