Reinacate as an original character maybe with character editor like in ck3 with traits and so.
Wishes:
Limit- breaker skill: a no-Brainer skill everyone should get in Danmachi cause it lets you break past the 999 stat mark
Slayer-Magic: Like the name tells its magic from Fairy Tail and a mix of God, Demon, and Dragonslayer magic I would do it with 10 elements (my choices would be: Fire, Water, Wind, Lightning, Light, Darkness, Life, Death). My idea is that you can unlock 1 element per Level.
and last but not least important would be a skill that lets you choose 1-3 skills for each level.
I don't think that's too overpowered at the start but later it is really.
I hope someone can pick this up cause I think it's a really nice idea, well if I successfully right my other fic I will try this one next.