The unknown M/M team is in matching light blue shirts, matching khaki shorts, matching short brown hair. Judging by their shirts and backpacks, I'd say their team color is blue, but that color's already been taken.
I don't think the lady in the orange team is African-American.
As for the mystery color team, they have orange, blue, yellow, white, black, purple... I don't think they even know what team color they are.