What about purple and gold?If that happened I would have to change my project all over again, because these are the golden pranksters colors. XD
since they've exhausted all the primary colours, i believe they will move onto secondary colours (purple, green, orange) next. and after persona 6, that's when they'll get intoP1 and P2 cries in the cornertertiary colours . personally, i'm hoping for purple or green