Hm, let's see:
Onmund (he's such a freak of nature, but I think he's cute so I married him), Serana (because she's s sweet girl even for a vampire), Paarthurnax (he's like a father to my character, I can't bring myself to kill him), Brelyna (again, she's cute), and Miraak (despite the fact that he's kinda like Ulfric, but I love him. He's just so badass!).
That's all I got so far.