>>84656500She is a joke character. A mutant with squirrel powers. That became this running gag of beating every big bad in the marvel universe, off panel.
Rejected by the Xmen for having a fluffy tail.
Rejected by Ironman.
Started her own Avengers/Xmen team of rejects.
Became Luke Cage and Jessica Jones' nanny.
Sort of an Avenger because she lived in the attic of the Avenger's Mansion.
Made a proper Avenger as part of the AimVengers.