I would pin him just as a multicolored since he doesn't really fit into the butterfly category, he would need distinct bands of color and a while band at the edge of his fins.
I almost wanted to say a Blue and Red Mustard Gas but I'm fairly certain that's not possible lol, he's just got the pattern of a Mustard Gas.
Rembrandt II, Suiché
Leopards: 1:4 Hawkeye, Luna, Astrael, Dorian, Cullen
Gargoyle: Cloudjumper and Toothless