Dragan
Dragan is a demon in hell that has tied himself to Chloe in an effort to help her gain control of her succubus nature because she can't hurt him by feeding on him. What he didn't count on was falling in love with both Chloe and her cousin Mouse. He's now tied to both Chloe and Mouse not out of obligation but by his heart.
He doesn't have an official canon. He's an original character made for a specific completely au future of Gossip Girl, but being a demon allows him to flicker through any canon that has that mythos.
hellsxpainter
PB: Collin Farrell