I really don't like Danse. I just find him annoying, I go out of my way to do actions that he doesn't like just because I hate him that much.
I know people like to shit on Preston but it's not his fault, he's an amazingly written character but due the rapid quest giving he can become a bit annoying, but that's fine to me because I can at least get more experience, I feel like if the game did him a bit better, people would have liked him at the very start, and not just now.
Edit: I also almost forgot about Elder Maxson, Myron, Jun Long, Marcy Long, and Shaun, I hate them all, and the reasons why I hate them are very obvious if you have played Fallout 2/4. Other characters that are my favorites are Goris, The Atom Cats, Kent Connolly, Piper, and MacCready.
Goris because I just like him, and the idea of a smart talking deathclaw is interesting to me. I like Piper's story, she wants to do good but is terrible at her job. MacCready due to the fact he can relate to the Sole Survivor on a parental level, and honestly because he's a huge dork. The Atom Cats because I love cats and they are also huge dorks. Kent because huge dork. I just love characters that are fucking huge dorks.