Idun (Shin Megami Tensei)

Idun is a demon in the series.
Idun, also spelled Idunn, or Iduna (Old Norse: Iðunn), is the Norse goddess of apples, youth, spring and rejuvenation and the wife of Bragi, the god of poetry. She was the keeper of the magic apples of immortality, which the gods must eat to preserve their youth, and so was treated as a granter of eternal youthfulness.