Originally Posted by
BAMF
Proposal for the room: What is we are seeing the origin of the Legion now? Some people had issues with Mon-El founding the Legion, and afterwards, the costumes. What if the Legion's interactions with Supergirl in the past are what inform their mission statement in the future? Sure, Mon-El got everyone together, but the Legion as we know them may not come into existence until they fight alongside Supergirl -- hence, their decision to ditch the black leather combat suits and wear flashier costumes? It can't be a coincidence that Mon-El suits up in his classic costume only after returning to the past to meet up with Kara.
Honestly, I think a lot of the choices they made for the Legion may have been because of Martian Manhunter -- a green telepath. Imra might have been turned into a telekinetic because we already have a telepath. Brainy may be blue because MM is already green. I also remember James Gunn discussing how difficult it was getting Gamora right for Guardians of the Galaxy. Apparently, green makeup is extremely hard to get right -- I think he said they may have even experimented with other colors before sticking with green.