So I kinda like the story for her. Ill explain it in a very short manor- Aife is ruins younger sister. She fell in love with a devil. The devil was killed by angels and the soul of the devil possessed her. Since this doesn't usually happen it just completely changed her. She looks even younger than how she really is. She was going to be killed since nothing could get the devil out of her. And ruin saved her. Which is why ruin is a traiter

Her brother