I was thinking that the players select what color they want to see themselves and their opponents in. The option would be given to both players. Obviously the colors won’t be absolute. It will be relative like “friend or foe colors” option. In 1 vs 1 it won’t matter.
In 2 vs 2 it could be a problem since there are more than 1 enemy. So that’s why I said 1 vs 1.