ComedicDuck I get that the first or second occurence of friendly fire is usually unintentional - sometimes the action is too chaotic to real-time acknowledge who exactly is on your team.
Personally I think to make teammate identification easier, they should just implement a glowing outline or "aura" around your teammate of the respective team color. Would make it MUCH easier to see who's actually on your side imo. Or maybe like, a very brief prompt before the countdown starts "You Are Team insert color here" that actually shows you a full view of your teams' character models.