
Oisin's life is almost like that of her namesake's, as written here:
In Irish legend, OisÃn was the son of Fionn MacCool, the leader of the Fianna, and of Saeve or Sive, a goddess. Sive was turned into a deer before her son was born, and she brought him up in a forest, given him his name, OisÃn, that means little deer.
Oisin is a shapeshifter and yes, a deer is one of her forms. Her main form is a jackalope from old western lore.
Oisin is a relatively new character, so I'm still working on her background info. :3
*I hope I put this in the right area. D: *