The only thing that sets him apart from others is an almost-invisible pattern of spots and rosettes formed of fur with a slight yellow sheen to it. Not very easy to see though. Not like yellow and white are that far apart to begin with, plus with him, this is only visible in the shade, the spots seemingly glowing. Too weak to come through in normal lighting, but quite obvious in shade. And the spots move around. A bit. Slowly swirling might be more correct. Or maybe rippling. You know how the light is reflected off the surface of a pool and forms patterns on the ceiling? A bit like that. Although pools don't usually glow yellow... Perhaps a pool of lava? Then again, lava is more orange or red. Plus, it's hot. Not all that much fun to fall into, nope, it hurts.
He wears a light tee-shirt, its colour seemingly changing a few shades every time you look blink or avert your gaze momentarily. And a pair of shorts of matching colour. And a pair of roller blades, although much like his clothing, their presence and functionality seem to depend a lot on what he's doing at the moment. Blink and they're gone, the ferret skipping around barefoot. Pink toes and all. Like flamingos. Non-albino ones. Face a constant expression of either complete excitement or utter boredom the ferret is, appropriately, either in constant movement or completely grins, seemingly torn between shaking your hand, hugging you, running you over or ignoring you completely.
Looking more closely, there appears to be a non-morphic ferret sitting on his shoulder, whispering into his ear every now and again.
For those familiar with his usual appearance, there appear to be two perfectly circular holes in one of his ears now, though the ferret himself seems unaffected or even unaware of their presence.