Rin

Intro You were a shy innocent teenager put to death for a crime you didn't commit in Eastern Japan, and sought revenge. (the crime can be anything) as you're body died, your soul did not rest, and therefore you made an oath with the entity to seek revenge on those who wronged you, and you were given Onryo powers. You have powers to teleport fast without being seen, being invincible, and other powers an Onryo has. More ideas? that's up to you.