Animation Source Forums

Unfortunately the multi-coloured option doesn't exist and when I made the characters' pages, I picked the colour that was used for the "main" characters, in this case, the green Terrible Terror from the dragon arena. Monstruos Nightmares are sticked as red when there are some purple ones too, same goes for the brown Gronkle or the blue Nadder. They're not the only ones, take a look at some characters in the other sources, a wolf that is coloured with many colours like grey, black, brown, light cream has to be sticked with only one colour, probably the one that covers most of the body. My fursona is black and white with red markings, yet I had to stick her as only black.
I doubt this will change :C with all the issues that the Sources have, this is a minor one. Annoying yes, like with the dragons, but I doubt it will be solved.
If you want, I can write in the bios that the Terrible Terror has other colours too c:

Guys, please don't pressure Saske. She's got enough on her plate and if she doesn't want to join your RP then respect that.

...And, Arm please use proper English (as in don't text talk).