Amazing birthday announcement. MAN. Not only Budokai, but Budokai TENKAICHI!? That's my favourite anime type of game ever. Also, my favourite Dragon Ball Z franchise. Can't wait to see how they will do it. Either way, it has A LOT to be determined coming after 3, and after this long.
The biggest issue for Mortal Kombat's story is the extensive killings. Yes, the killings. In other franchises like Tekken, King of Fighters and Street Fighter most characters do not die. Which makes there be more room for including past characters. And, while it does seem like the devs of Mortal Kombat wants to do that as well, they have to go through a ton of bullshit necromancy ++ to get x character in to y game and the more they keep "killing" due to the wow/shock/overbloodydone factors the story will suffer from it regardless.
It is true that SVC Chaos was a mess of a roster. It had weird choices like Choi Boungei, Earthquake, Hugo, Goenitz, Mars People, Firebrand and Tessa, just to name a few.
Also as mentioned, CVS seemed like it indeed was intended to be KOF vs SF + Friends, which is fine, because that is basically what SNK does. The whole King of Fighters spheal is simply an amalgamation of Fatal Fury, Art of Fighting, Samurai Shodown, Metal Slug/Ikari Warriors, etc.
If one would TRULY wish to see a diverse representative roster for a Capcom vs SNK roster we would have to look into Capcom vs Marvel terratory, and SNK Battle Coliseum terratory. Both franchises have a bunch of interesting IP's and classics that could be implemented into a crossover.
However, both SNK and Capcom are mainly fighting game companies, and their top IP's are in fact King of Fighters and Street Fighter for SNK and Capcom respectively, and that's not wrong to try to bring their best into one clash, plus, it would indeed help that both are fighters when making a fighting game lol.
To me I feel Nina has never looked so badass as now. I love her T4 and T5 designs especially, but her T8 is really badass. Never been much of a Nina player, but might give her some more time of day when T8 releases.
You have created a lot of great sprites and smooth animations, that I'd just say go for it, and make it how you want. There is tons of resources that you have made. I'm just so excited for this minor FF fighter. Thank you.