5.0 hints?

[Niqote]

TBH the first Red mage clue was given in the Rising seasonal event inside of 'The eighteenth floor' (2015 i think?) where 2 NPCs say something along the lines of:

NPC 1:What comes after White and Black? Red!
NPC 2:Red? Don't you mean Blue?

So yuh, we shall all be clueless together until Yoshida reveals his shirt come Fanfest XD (The ''red mage'' shirt was the Scarlet Witch one iirc)