Dark Romance...I think?

I like the villains' and anti-hero types that end up being still them but get the girl/guy in the end? Maybe the hero goes dark and slightly comes back? I like a more fantasy type thing, but am willing to try other types. Just no westerns. Any reading level besides children lol.
EX: I have read most of the POTO fanfics where Erik ends up with Christine in the end(I only like those); Poison Study series was a fav, etc.

Well, they aren't fantasy, but you might want to try the Acton and Doyle Scotland Yard Mysteries. Acton is very dark and weird and obsessed with Doyle. And he stays that way throughout the series. The first book is Murder in Thrall.

The Paladin series by T. Kingfisher has this. First one is Paladin's Grace.

The Raven Cycle by Maggie Stiefvater and there’s a further series related to it. Very odd characters.

Dark Prince by Christine Feehan, the first book of her Carpathian series which has a huge amount of novels in it.

Dark Lover by J.R. Ward is another first book of a huge series, The Black Dagger Brotherhood.

These are both paranormal romances, both dark, with questionable leading men. They can be rather explicit so just be warned!

Thank you all! Will give them all a try!