According to GilgameshKun and GhavarKhai from currant purple to soot black:


Joker devours the Xelphatol apple.
Joker's plumage will change in 6 hours.
Joker is beginning to grow new feathers!
Joker devours the Mamook pear.
Joker is beginning to grow new feathers!
Joker's plumage will change in 5 hours and 59 minutes.
Of the 1 party currently recruiting, 1 matches your search conditions.
Joker devours the Mamook pear.
Joker is beginning to grow new feathers!
Joker's plumage will change in 5 hours and 59 minutes.
Joker devours the bunch of O'Ghomoro berries.
Joker is beginning to grow new feathers!
Joker's plumage will change in 5 hours and 59 minutes.
Joker devours the Xelphatol apple.
Joker is beginning to grow new feathers!
Joker's plumage will change in 5 hours and 58 minutes.


I think those new feathers were brown shades ?!?!