:0 !!!! omg im honored you thought of me to ask this question. (also thank u for liking my art <3) I do really like the 3 you have characterized, those do suit them! I do think Mark would also be a good flying type trainer too. It's kinda related but it reminds me of how he wanted to be an air bender if he was ever in the atla universe. Mark with staraptor would go so hard...

For the other members, I'm a sucker for Psychic Renjun. Espeon is already perfect but imagine him with gardevoir/gallade (like wally) or espurr 🥺🥺 so many psychic pokemon fit him. I think if he wasn’t physic either, he'd be a very cute ice trainer. Even ghost for him would be cool, although maybe he'd be scared jfhfh

For Chenle I immediately thought of dragon... he'd be so op if he was but that suits him i think to be an absurdly strong trainer. If you wanted a less overpowering type maybe Dark? He'd look cool still LOL

For jeno I like fighting, steel or even rock? I do think im leaning into steel bc of the steel type pokemon like arrgon and lucario suiting him.

For jisung, I think I have trouble thinking of his the most... in my head I like the idea of him as an all round trainer who has every type but if I had to narrow him down maybe water? normal isnt bad either! Jisung with smoliv :]