Um, a changeling, obviously.
Descendants of various fay: fairy, pixie, sprite, spriggan, sidhe, etc, etc.
Did you have anything in particular in mind? Because you could be a vampire, a rakshasa, a deva, an asura, a cambion, an incubus, a succubus, a lotophagos (lotus-eater), a siren, an angel, a demon, and plenty more...
“…Judge not what a man has done, but judge what he could have done if he was a different bloke altogether. For art thou a leper? And a leper can changeth his spots…” --Rudy Wade, Misfits (Series 4, Episode 8)