I'll leave some suggestions~
Cynder from the Legend of Spyro
Amaterasu from Okami
Vulpix/Ninetales from Pokemon

Judy Hopps or Nick Wilde from Zootopia

I second this.

1) Kazooie from Banjo-Kazooie
2) Falco from Star Fox
3) Tokoyami from My Hero Academia
4) Rev or Rip Runner from Lunatics Unleashed
5) Wave the swallow from Sonic
6) Celeste from Animal Crossing

... I like birds...

Mew from pokemon.

Haru from Beastars

A Mega Mawile~

Espeon!

Klonoa from Namco's Klonoa series!

Undyne

What about Shauntal or Hex Maniac from Pokemon? :)

1. Mag/Limbo - Warframe

2. Isabelle - Animal Crossing

3. The gremlins from Spiral Knights.

4. Glitch - Metal Arms, Glitch in the System

5 + 6: Spanx & Redmond - Whiplash (2003)

Hmm.

Mae from Night In The Woods.
Funtime Foxy from FNAF Sister Location
Flora from TwoKinds
Katherine/Kat from TwoKinds
Haru from Beastars
Legosi from Beastars

Any particular preferences you have for character type, or thoughts on the scenarios you're planning for them in the format? I'm expecting they'll all be in one form of bondage or another, personally ;P

They'll all be in diapers, whether or not they're in bondage depends per character if I feel like locking them up in bondage. There's no specific character type this is limited to, so quadrupeds are fine too.

Righteo! Well then, some suggestions...

Raichu, because he's always stuck in the shadow of his more popular siblings.
https://mobile.twitter.com/Pokemon/.....28445839876102
Major Meoskers, the ruffinest and toughinest kitty captain!
https://youtu.be/6Re0EIsoGZo
Pete's Dragon, because he's a great big lovable galumph of a derg he has a habit of destroying things, but he doesn't mean to he's just clumsy is all.

Nui Harime from kill la kill

Me! Hehe, kidding.

I say The main trio from Harry Potter if you want to do humans, and Brian (maybe with Stewie) from Family Guy if you want to do animals.

Retsuko (Aggretsuko) She’s just adorable. Could serve as another form of stress relief for her?
Brian Griffin (Family Guy) Probably should knock him off his high horse, huh? Maybe a new girlfriend that’s really into it?
Impmon (Digimon) Same as Retsuko, really.
Spyro (Spyro the Dragon) Again, cute.
Rocket Raccoon (Guardians of the Galaxy) Plenty of opportunities for fun with him.

Your wish is my command.
Renamon from Digimon Tamers.
Jinx from Teen Titans.
Nepeta from Homestuck.
Astolfo from Fate Apocrypha.
Midnight from My Hero Academia.
Tatsumaki from One Punch Man.