Kingdom Hearts: A,B, Q, and T.
pfft like this is a difficult decision--seiner for sure, dude. there's a reason that when i say 'i'm gonna replay kh2' i really mean 'i'm gonna hang around in twilight town for as long as possible.' (tho i am actually replaying all the video games i have in the kh series rn. i don't think i ever finished kh, which isn't really surprising considering the bad habit i have of stopping games right before the final boss, haha.) but anyway, 'those two little assholes' sums up my feelings on everything i ship pretty well, and seifer and hayner fit that to a t. (also on my to-play list is ffviii so i, y'know, have more than just twilight town seifer.)
B - A pairing you initially didn’t consider but someone changed your mind
i'm not actually sure there are any of these? i'm a multishipper so there are a lot that i don't consider and then all of a sudden i see a well done gifset or fic and i'm lovin' it. there's not really any changing of minds necessary, haha. but in my early fandom days i was strictly an akuroku shipper (thought i'm sort of indifferent now) and in one of those fics there was a seiner side pairing, and well, i was completely gone. new otp.
i can't remember demyx/larxene was something i came up with myself or if someone showed me something that made me ship it, but, uh, that too i guess. probably not the best for demyx, but hey i love unhealthy relationships so i'm all for seeing it in fanart/fic form.
Q - A ship you’ve abandoned and why
hmm, not sure i've had any of these in any of my fandoms. i mean, there are fandoms i've abandoned, haha, but i don't actually ship things in most of my fandoms so this doesn't count.
i'd maybe say akuroku though. it's not really an abandonment though, just more that i found things i like better? and i haven't really found a reason to go back to it. i have no idea what the shape of it looks like after 358/2 days is. I never finished the game (i broke my DS right in the middle of it and didn't get a new one until a year later, and it's hard to get back into a game after a year), actually i barely started it (i think roxas was sleeping and there were seashells on eyeballs or something???? the last thing i remember i mean. though there were probably missions after it. idk.) so i have no idea if anything changed when the organization got a closeup. (i did find that i love playing as marluxia though haha)
T - If you mostly have homoships, do you have any heteroships
haha there's like two girls in all of kh. (okay not really but if feels like it sometimes). I don't really identify with m/f ships (occasionally the queer ones, but kh doesn't have any of those) though so, uh, not really anything i actively ship? i'm pretty indifferent to all m/f ships.
i love olette so i tend to ship her with everyone, which is a lot of twilight town peeps (inc seifer and hayner even if they are my otp) and also naminé. i like sora/kairi more than sora/riku, but i don't ship either (sora/riku/kairi, on the other hand whooo). i don't ship naminé with any dudes whoops. and i already mentioned larxene/demyx haha.
i've only played kh, kh2, com, and part of 358/2 days so my knowledge of kh lore is severely limited compared to the more recent stuff that came out.