Because we know Misty/Danny definitely WON'T happen in Iron Fist, and everyone seems to get at least two love interests, who do you think will be Danny's?

I don't think it will be Colleen, it looks like it could be joy. Random choice, but Sparrow is a possibility. If he's lived for 15 years in K'un-Lun, including his teenage years, he may not be a virgin.