Sonia - Shiny! Galarian Ponyta; She's foreign so it makes sense she's a regional variant Pokémon, also she's definitely a unicorn. And how perfect is it that Galarian Ponyta's shiny colors match up perfectly with Sonia!!
Kazuichi - Poocheyna; He had to be a dog of some kind and Poocheyna's teeth fit him perfectly. I almost chose Rockruff, but I'm happy I went with Poocheyna. (Trust me if there was a steal type dog, it would have been my first choice)
Nagito - Absol; Its pokedex reminds me so much of Nagito. It's seen as a doombringer when it really is just well meaning with a calm demeanor. Which might not be 1 to 1 with Nagito, but it fits well to me. Also Absol is a fairly iconic pokemon and Nagito is one of the most iconic DR characters.
Gundham - Glaceon; AS THE SUPREME OVERLORD OF ICE, HE WAS ONLY WORTHY OF BEING AN ICE TYPE!!! Also Glaceon was definitely the Pokémon easiest to mix the design with and totally not because Gundham is my favorite character and Glaceon is apart of my favorite Pokémon's evolution line. (Its for both reasons)
Sayaka - Shiny! Sylveon; Sylveon is my favorite Pokémon I couldn't not involve Sylveon in a Pokémon crossover c'mon who do you think I am? Someone normal? Sayaka fits Sylveon in my opinion because of both Sayaka's IRL Cute Charm ability, but because she's not to be underestimated. I mean Sylveon is nicknamed the dragon slayer Pokémon because of its pokedex. Also normal Sylveon reminds me of Sayaka's pop idol outfit!
Leon - Litleo; Leon literally means 'lion'. Also if anyone is 110% a fire type, its Leon. I almost chose Vulpix cause I like Vulpix and its cute, but Leon's design translates better into Litleo! (I think he'd have both on his team tho if he were a trainer)
Makoto - Eevee; SOMETHING ABOUT MAKOTO GIVES PURE EEVEE. HE'S 5'3, NORMAL, BUT SOMETHING ABOUT HIM IS CHARMING!! I'd think he'd be like Chole's Eevee in Horizon's and not be able to evolve but Copycat moves from his friends! (Might make Hajime an eevee too, but idk, feel free to give me spoiler free suggestions!)
Byakuya - Ninetales; He's 100% fox energy, and Ninetales is a very sophisticated looking pokemon to me :)