B - A pairing–platonic, romantic or sexual–that you initially didn’t consider, but someone changed your mind.
Richard II/Robert de Vere. Or, as Shakespeare's History Plays fandom calls them, Richard/Robbie. I never considered them initially, but the Shakespeare fandom made them both so likable and so cute that I can't help liking it. Also, Richard II/Duke of Aumerle, thanks to the RSC performances of David Tennant and Oliver Rix.
D - A pairing you wish you liked but just can’t.
I'll give you an opposite sex pairing and a same-sex pairing.
For the same-sex pairing, Benjamin January/Hannibal Sefton. I wish that I liked it, as that would give me more stories to read in the Benjamin January mysteries fandom. (I think that the two are awesome together, but I only like Ben and Hannibal as best friends, not as lovers.)
For the opposite-sex pairing, Harry/Dresden/Karrin Murphy. I wish I liked it because it's obvious that the author ships it; there have been anvil-sized hints about the two of them loving each other, and I'm sure that he intends for them to sleep together at some point. I just don't care for it. I prefer them as best friends and sworn siblings—especially since neither one has had anything approaching romantic good fortune. I'm very much afraid that a romance would get Murphy fridged to give Harry angst (because it's not like he has any other reason to be miserable). That is the last thing I want.
H - What is your favorite source text for fandom stuff (e.g., TV shows, movies, books, anime, Western animation, etc.)?
Books, because books are the most accessible. I can get books in a bookstore, a library, or online, and I can pick them up anytime. After that, anime, which is pretty accessible online.
Movies and TV shows (unlike YouTube shows, which I can have going on in the background) demand that I watch and listen rather than just listen to them, which means that I can’t be doing something else at the same time. Also, movies generally cost more, cumulatively, than books. And I often hear so much about movies and TV shows that by the time that I know whether I want to watch one...I feel like I already have.