Hadrian Salazar Slytherin Riddle

It's the end of 2nd year and Harry is losing himself. He overheard his supposed bestfriends talking with his headmaster. It turns out that they were stealing from him and after he defeated voldemort they planned to kill him. He doesn't know what to do with himself.

And on top of all this he uncle has found that using him as a human punching bag a 'relaxing' sport, so now he's lying on the stone cold floor counting down the seconds till his birthday.

What happens when he goes through a creature inheritance that makes his life do entire 180.