Deis (Breath of Fire)

Deis is a character from the Breath of Fire game series who has appeared in every sequel except Dragon Quarter. She is a playable character in BoF1 (known as Bleu in the English version) and BoF4 (as Ershin, although this may be a different Deis), as a hidden character in BoF2 and as a master in BoF3. In each game she is depicted as a blue-haired (except in BoF4 in which she has long black hair) immortal being with strong magical powers and usually a serpents tail, resembling a Naga.