All known references from my knowledge:
(Character's i'm unsure about will have a (?), Character's I dont know will be seen as "???"
Sora: Sora, Valor, Wisdom, Master, Final (Order in which i'll present characters)

Edgy Friend: Riku KH1, Riku KH2, Riku DDD, Riku KH3, Dark Riku

KindHearted Friend: Kairi KH1, Kairi KH2 (School Uniform), Kairi KH2, Kairi KH3, Kairi's Goodluck Charm(?)

Roxas&Friends: Roxas, Axel, Xion, Saix, Roxas (Black Coat)

BBS: Vanitas, Terra, Aqua, Ventus, Eraqus

Oops! All Xehanort!: Xehanort

Party: ???, Goofy, Donald, Mickey, ???

FF7: Cloud (KH Outfit), Tifa, Aeirth, Yuffy, Sephiroth

FF10: Tidus, Wakka, LuLu, Yunna, ???

TWEWY: Neku, Beat, Shiki, Joshua, Rindo(?)

The Bouncer: Sion, Kou, Dominique, Mugetsu, PD-4

Anime Swordsman: Marth, Roy, Robin, Corrin(?), Azura(?)

Triforce of Heart: Link, Ganon, Zelda(?), ???, Fierce Deity

Icarus: Pit, Magnus, Dark Pit, Amazon Pandora, Viridi

Hearts of Bionis: Shulk, Reyn, Melia, Dunban, Alvis

Undersomething: Frisk, Papyrus, Flowey, Chara, Sans

Fungang + Lancer: Kris, Susie, Ralsei, Lancer, Kris (LightWorld)

Abyss: All same color, from Abyss mode

Drip: All same color, Probably a reference to Golden Rank

Symphonia: Lloyd, Presea, Genis, Kratos, Mithos

Glint of Coldsteel: Rean, Gaius, Crow, Jusis, Rean (Ogre Form)

WildCard: Persona 1, Persona 5, Persona 2 Eternal Punishment, Persona 4, Persona 3

Featuring Dante: Dante, Nero, V, Vergil, Devil Trigger

Card Game: ???, ???, ???, ???, ???

Here Comes Daredevil: Sol, Aba (?), That Man (?), Ky, Ramlethal (?)

The Wheel of Fate: Ragna, Mai, Kokonoe, Jin, Iganami

First Clause, Divide: Hyde. Gordeau, Londrekai, Linne, Hilda

Workshop: ???, ???, ???, ???, ???

Pocket Creatures: ???, ???, ???, ???, ???

Warriors of Light: ???, ???, ???, ???, ???

Brasil: funni Brazil

Pocket Creatures screams Pokemon to me, but I can't figure out the specific references either.

Party is Pirate Sora, final form is halloween town
Final FF10 is dissidius Tidus
Triforce Master is Sheik
Anime Swordsman is Corrin and Super Saiyan Marth(Tokyo Mirage Sessions)
Daredevil was right, just it's happy chaos rather than asuka(color scheme worked better)
Card Game is inscryption(the 4 card gods and final is mushroom god or whatever I had Vfork tell me who)
Warriors of Light is Final Fantasy: Jack is base, /dark knight//White Mage/red mage/sage
Workshop is Lonin/Scaryami/Blaze/Pastelle/Mal
Pocket Creatures is general color schemes: Farfetch'd? might've been sirfetch'd/Absol/Delphox/Sceptile/Zacian
(Source literally the person who made all the alts)(also I don't remember the kairi final alt but it's from some design of hers

The last one for FF10 is Shuyin from 10-2.

idk who that is, so nah

oh looked em up, ig on a technicality probably counts? but I based it off dissidia tidus lol