Cool! I was thinking about a race called Murinae, who can take on the form of humans, with mouse like traits and features(i.e., tails, ears, claws, whiskers), but also revert to their mouse forms by will(enabling them to fit into small places, run faster, etc). I was kinda thinking my character could run/work in a shanty cabaret on the surface world, and it could maybe serve as a hub or inn or the ilk. And because she's a Murinae, no one expects her to be a gun-slinging badass perfectly capable of throwing a hardened thug out on his ass for starting fights or harassing the girls. (We run a respectable song and dance strip show here, bud, if you want hookers go see the place down the block)

I just thought that kinda character would be pretty interesting, and since they're all mice who are regarded as too weak to even other with, they'd be ignored through the grand historical wars and struggles of elves and dwarves and men, and in turn would ignore the politics around them.