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.Marvel Source
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!
Passives:
Squirrel Friend - damage buff for summoned squirrels. Summons squirrels passively, and also has an enemy slowing/squirrel speeding buff that jives well with Death From the Trees attack.
Squirrel Cunning - crit buff for summoned squirrels. Squirrels hit harder, more often.
Squirrel Distraction - summoned squirrels buff my dodge ability. Really adds up with 30 squirrels, so I basically never take a hit.
Spirit of the Squirrel - important health and spirit buff, particularly for that 6 spirit regen effect.
Counter Attack - just put one point here to take advantage of the passive counter that not only does some minor damage but also buffs her dodge even more. +1 to all powers equips will make this even more powerful so it's worth dropping one point.
Attacks:
1 - Squirrel Special Forces. Hit with this first to max usage given the 45-second cooldown. Summons 8 squirrels and buffs damage and crits for all squirrels.
2 - Sic 'em. Summons 5 squirrels and buffs attack speed for all squirrels (building on Squirrel Friend and Death From the Trees, which also deal with speed). Costs no spirit so this is the button to hit when spirit runs out. Although the 8-second cooldown means I can't spam it, I'm usually okay running around a bit while my spirit regens. Equips (Gibborim, Super Soldier Serum) mean this doesn't take long.
3 - Death From the Trees. Damage + slow. Great crowd-clearing attack and also works well on bosses.
Finally, I use Forestwalk to quickly flee from danger, Squirrel Love as a quick tap from time to time if I notice I'm taking damage (rare due to dodge buffs), and Claw Claw Kick for those rare occasions when spirit is an issue and I have nothing to do for the 8 seconds while Sic 'em is inactive.