Been thinking of sona ideas since I don't really have one, Tarnish doesn't really represent me personality wise and he's more like just another character.

Weird, moody, bird-like creature that can lighten/darken depending on mood. As an excuse to avoid consistency, he's oddly malleable to the point where you'd nearly think he's made out of putty, able to alter the shape of his beak, those circles on the back of his head, and the rest of his body.
His eye-pupil shapes can also change depending on mood, like if he were feeling money hungry they'd become dollar signs.