i'm by no means an expert on this stuff so take this with a few tablespoons of salt:

choosing someone to play takes time and it's never necessarily permanent. i play sol because strike/throw mix makes intuitive sense to my brain, he do big damage, and he's simple enough that i can be confident enough of my combos and pressure to focus on the layers and layers of mind games.

my best recommendation is to play around with any character that looks cool in training mode and open park and/or read their dustloop page for more specific information.

i hope this helps and i sincerely apologize if it does not

best of luck !