A Decent Self-Insert, Probably

Tempest was quite surprised to learn that Kingdom Hearts was a true story. Especially since she learned this by her world falling to darkness. She also has a brother now, which is... new information. Keyblades in hand, the two set off to help Sora complete the Xehanort Arc, and to investigate an old rediscovered threat to the worlds. (Backburner'd - but not cancelled, I promise.)