I have no links but there are Elven Harry C2's on ff.nuts, which contain fics like this.... I'd like to see a Centuar!Harry one though...

 

Go to the Harry/McGonagall section and there is a Werewolf!Harry story. I think Greyback found the Dursley's when he was young and killed Vernon and Petunia, bit Dudley and bit Harry.

McGonagall looks after them at Hogwarts. I stopped because I dont get along very well with young Harry stories. Even first year Harry stories annoy me a lot if not done really well. I guess some people might like it.

I've seen a Dementor!Harry one but I cant remember its name. I think it had a Harry/Draco friendship in it, not slash. He was thrown into Azkaban I think... I'm not sure how he became a dementor though. It wasnt the best but yeah... better than some shit.

Demon!Harry is a rare one. Sera has that one nailed though with his story. There is that new one where Harry pretty much becomes a look-a-like Hellboy but its not very good. Mine will probably turn out to be a Half-Demon!Harry instead of Half-Vampire. Not clear on that yet...

Naga!Harry I've seen once... it had about five chapter and it was fairly good but I'm pretty sure it was ripped from FF.Net. If I ever find that again I'll be sure to point you towards it.