I'm not sure if these are still open, but thank you for the chance!
name: The Stranger
pronouns: he/it/thon
custom species (human(oid), feral dog, anthro cat...): Human (sort of)
theme: Eldritch cowboy, imagine the King in Yellow meets a standard spaghetti western :>
palette/moodboard: Mostly yellows, but you can add beige/black/white where you see fit to break up the monochrome!
extra references: I have a moody little paragraph I wrote to sort of give inspo for him! Whether or not the "mask" described is real is up to you :>
Picture this. It's the late 1800s, you're sitting in a sand-encrusted saloon sipping on a lukewarm whiskey, grateful at least to be briefly out of the sun. A stranger walks in, sure-footed and silent, shrouded in yellow (for there is no other way to describe it, many gunslingers in the west wear long ponchos but his somehow feels wrong); and misses the quintessential squeaky board near the door, as though he's a regular. An unusual breath of cool air follows him in; must have been a lucky gust of wind...
He takes a seat at the bar and orders the same as you, which isn't terribly peculiar; but...you never see his mouth move. From what you can see of his face you realize with relief that he must be wearing a lifelike mask. Surely that explains it. It's even cracked in a few places, like sun-hardened skin...
something to add (body type, main color, an specific pattern you want me to add...): I'd love if he had longer white hair and yellow eyes! :> Have fun!