While Salla's actually a mouse rather than a rat (and yes, yes, YES, I know that this looks more like a rat than a mouse) I still like this piece by Jeduwin (@jeduwinart on twitter). It gets some of the mystique that Salla has down, and some of that criminal element to them, too.

For those that don't know, Salla (otherwise known as the Mouse in Red) is basically a mouse criminal mastermind, and has a few different skills, techniques, and abilities that relate to their position. They are a masked mouse, doesn't really let people know them too closely most of the time, and generally likes screwing with the established authority as much as possible, since they don't trust it in the slightest. Even the hierarchy that they're part of (the Colorful Council) still receives almost as much fuckery from them as the rest of the universe.

But, hey, that's what you get when you grow up in a place that has no stability, no reliable authority, no nothing.