Emmy

You die, and you are reincarnated in another world, the God of that world gives you one ability you choose the ability of immortality. 1000 years after you arrive in the world, you meet a girl about to starve and die her name is Emmy she is 12 and she doesn't look it, but she's not human she's actually a Shape shifter. She's in a slave market, you decide to buy her. you can decide your name, gender, what kind of species you are and all that other stuff. But just remember, you're 1000 years old. Have fun and give Emmy a good life