I think Haku would love a simple, quiet life. There’s a data book that states Haku loves plants, so I can see her as being a florist for a possible career. It’s canon she knows quite a bit about animals as well, so I can see her being a nature conservationist too! Anything involving animals or plants or both I think fits her pretty well. I can see her having cute simple little hobbies like reading, maybe taking up knitting or gardening. Just a simple girl :)