Personally I believe is blue hair as he show side where is his scared, glad (to be with MC) and he also come out of isolation room looking confident which if he represents timidity he would still be afraid and I think that orange represents Hyung's timidity.
I don't think is short hair as I know he is up in running too, as I believe he is hyung' confidence. He always looks and sound confident when he appears or around MC and in situations he looks scared are those situations when u put anyone there and they will be scared just like the red hyung which is supposed to be selfish and coward but he still got scared when black wanted to hurt orange.
I do also believe orange is timidity, black and smarts!
Blue would be too obvious, he has already been called the "real hyung" before. I think Hyung is alot more sinister than we think.. I mean.. look at the early chapters when Doyoung books the hotel. Theres some fishy buisness going on and blue dosent seem to fit the mould. (Yet)
Apparently this situation might bring up a completely different side of him so we can not tell just yet that blue is the real one
True now that u put it that way
OK, so from what he said they are all a part of the personality hyung has so thats mean everyone carries one trade very distinctively and the one with the most mixer of different type of personality trade will probably be the real hyung. (If u don't get what I say he said that the red hyung is the selfish cowardly side of hyung so that means he is a fake cause he is just a part of hyung)
Can we all just sound off who we think is the real hyung and like what does the rest of the hyungs represent as a personality trade?