Got nothing to do right now, so i'll pitch some ideas for new, male characters. Might to female later, can't really think of anything too interesting right now.
-A hawaiian Sumo, inspired by Akebono. Would add some variety in bodytypes too. Personality wise he'd be a somewhat peaceful (as peaceful as possible as a fighter i guess), calm and kind guy. I'm thinking a bit like KoFs Goro in the animated series. Moveset would have a lot of slapping and pushing lol, the stomp that both Bass and Nyotengu already have (i believe it's even simply called Sumo Stomp). Nothing really to exciting i can think of in terms of moveset.
A dirty heel wrestler. He could be from anywhere really, british, japanese, american, canadian... doesn't matter all that much. He could have a stance where he falls on his knees and begs, which could be followed up by a lowblow, pulling the legs of the other character and maybe a rising headbutt to the chin, something along those lines. Of course, he would have Poison Mist as well. You could go as far as adding brass knuckless for the Break Blow and a Fork for a Throw like Abdullah the Butcher, but thats probably a bit too much. Could be a rival to Bass, as he'd obviously have no respect for the old guard and get a Masked Persona to mirror Mr Strong. However since there already are 3 wrestlers, this doesn't seem likely.
Last one would be an actor who used to play a superhero on TV/in Movies (think Power Rangers/Kamen Rider) but got replaced by younger actors and all that. A bit like a more classy Brad Wong, stubbles, a guy that looks kinda broken and doesn't have much motivation to do anything. He joins the Tournament to prove to himself and the world that he can still kick ass. Moveset would have all kinds of nods to Tokusatsu shows, so leaping chops, all kinds of Rider Kicks, Wire-Fu stuff... one of his alt. costumes would be his old superhero costume of course. Honoka could be a fan of his/recognize him. Could be from the States, maybe Brazil as i believe they have a somewhat decent Toku scene as well? or several places in asia.
All three ideas are probably incredibly unlikely to happen ¯\_(ツ)_/¯ But at least i killed some time that way lol