For the character thing... Elementary!Holmes.
1. OTP- Well, I would say Sherlock/pre-addiction!Irene, but that ended in a whole mass of heartbreak and confusion and feels (even though they were totally in love). Maybe the blonde twins from that one episode. They were awesome!
2. Most hated pairing(s)— Gregson/Holmes, Bell/Holmes, Watson/Holmes. I’ve always seen Gregson as more of an uncle/older brother figure to Holmes, not a romantic interest. Plus Gregson’s married with two young kids. Bell/Holmes, I feel more that they’re just good friends. And Watson and Holmes… while I can certainly see that their relationship can be treated that way, I think it oversimplifies their relationship too much. Same as how I feel with Johnlock as a whole. Also Alfredo/Holmes if anyone ships them.
3. Most unusual OTP— Hmm… ANGUS/HOLMES. You know they’re having a secret love affair.
4. Crossover OTP— Daisy/Holmes, cause of that one episode of Keeping Up Appearances:
5. Brotp/Friendship OTP— Joan/Sherlock, obviously! I love their chemistry, their friendship, the sweetness between the two of them…. how they help each other… far too much to distill into a little paragraph. Also Holmes/Gregson/Bell, and Holmes/Clyde, Holmes/Ms. Hudson and Holmes/Pam.
6. Character headcanon— I have a million! Umm… for one, I think that Holmes’ father wasn’t even a part of his sobriety regime but it was Mycroft the whole time. Additionally, Sherlock’s not a drug addict at all but Mycroft/his father, whichever put him through rehab only felt it was such because they were overprotective and felt that his habit was getting out of hand.
7. GIF— Some combination, if not all of these: