Ignoring any and all character deaths, focusing on the main casts of both (FFXV because I don’t know side characters as well; TRC because there are too many)
the characters i’d ship
the characters i’d ship
Still no ships. I’m really not a shipper, heh…
the characters who would be BFFs
Luna and Sakura!! Sakura would think Luna was the coolest person ever and Luna would love Sakura’s cheerfulness. On the other hand, I feel like Sakura and Noct would also get along well due to the fact that they both get how it is to be sleepy all the time.
Presuming that there wasn’t a misunderstanding to cause conflict, Gladio and Kurogane would become immediate Sparring Bros.
Not so much BFFs but Fai would 100% try to mother Prompto. He knows “insecure and trying too hard to hide it” when he sees it.
Iggy and Syaoran would get along famously. Syaoran would have all the questions about Eos and Iggy would have all the answers and also be thrilled to have an interested pupil.
Gentiana and Yuuko would get along and we should all be terrified.
the characters who would be enemies
If Ardyn had access to Yuuko, he’d probably try to make a wish. She would not be amused. Especially since Ardyn’s not particularly fond of following rules and tends to think he’s smarter than everyone.
Heaven help the Astrals if Sakura’s there when one of them gets summoned. Canon, she can talk to upset nonhuman things–but she’s going to want answers for why summoning/asking for blessings is so hard on Noct/Luna, and she won’t approve of what she’s gonna hear. (She’d probably start yelling at them before she remembered they were, in fact, gods)
If Ravus was acting like he was in canon, Kurogane would end up fighting him, but also giving him fighting tips and artificial arm maintenance tips, probably mid-fight.
the characters who would be allies
Unless there were feather shenanigans or a misunderstanding in the way, I can see the TRC group and the FFXV boys being allied.
the characters who would be allies, but reluctantly
Not so much reluctant allies, but if Fai encountered Ardyn…I think he’d recognize a little bit of himself, like, the worst possible version of himself, in the guy. It would scare the hell out of him but he’d also understand it and…yeah.
Assuming Sakura didn’t get a chance to talk to the Astrals, they’d probably reluctantly support the TRC crew being successful, because they a) want them off their world and b) don’t want Fei Wang Reed screwing up the timeline and thus undoing their plan to end the Scourge. (Guess whose favorite character isn’t the Astrals? It’s me!!)
the characters who would drive each other bananas
Ignis and Fai would probably try to get along since they’re both the “mother” of their respective groups and Fai likes cooking too, but their personalities are a little bit too incompatible for that, honestly….I mean, Fai has fun, but Ignis just kinda seethes and reminds himself not to summon weapons.
Syaoran and Noct wouldn’t actually get along that well, I don’t think. Syaoran is made of intellectual curiosity and really confused about how Noct isn’t even vaguely interested in all of this mythology and magic and how it works? Since he’s the most connected to all of it? Noct just wants to be left alone and play phone games/sleep/fight the dang monster already.
the characters i think are the most alike
I think Gladio and Kurogane, it’s just that Gladio needs more of Kurogane’s fleshed-out character development arc.
my favorite character from each fandom & how i think they would get along
I’ve had a hard time picking in FFXV, but I think it is probably Prompto. Fai’s been my favorite in TRC since high school.
Like I said, Prompto sets off every single one of Fai’s Mom Instincts. He sees the times when Prompto’s smiles are forced for what they are, and recognizes his efforts at lightening the mood for the group’s sake as well. It’s adorable to him, and also a little familiar in a way that’s just short of painful, so it’s time to look after the kid. Prompto takes to the attention like a duck to water, because most of the positive attention he’s had in his life is from his friends who are basically peers. Fai, who’s clearly older than them, is more like a parent even than Ignis, and it’s…nice. The fact that the attention means this much to Prompto doesn’t escape Fai’s notice, not for a second, so he just increases the thing, and Prompto loves it.