I will try to complete the roster
I will put chang and choi since they are not maybe that popular are least are iconic, then I will put billy with raiden and hwa jai for team vintage fatal fury
If not, just put Billy with Geese and shoe horn under the excuse that Geese will give him more of the drug that was wanting
Then I will put the Garou Team, Anti Kyokugenryu, Agents and Maybe the Sports team and that it. Saiki disciples could work too, Judging the real ending from the story mode I could see them appearing