Certainly:

Maros - Grey Face, Grey Fur Tabard
Black nose, no whiskers.

Coydo - (Brown Face?), Tan fur Tabard
Tan face, Black nose, White mouth and chin

Ursuja - Brown Face, Brown Fur Tabard
- Black on and around nose (intended to show a bigger nose)

Winter Caste Merrekit - White Face, White Tiger Tabard
- Thin black stripes, whiskers, 'kitty' pink nose

Summer Caste Merrekit - Orange face, Orange Tiger Tabard
- Thin Black Stripes, whiskers, 'kitty' pink nose

Faulkier - Orange face, (Ive seen them in tan tabards [past events] and orange tiger striped ones [this event])
- Correct, the Faulkier were in tan tabards in past events, and were changed to fur tabards to avoid confusion with the Coydo.
- Orange SPOTTED tabard, black face spots, black nose, no whiskers, white throat.
- Faulkier are given the RP direction to be stealthy and act alone. They're solitary mountain cats.

Ebrevoor - Huge horn in forehead
Also, a specific spotted beige fur pelt that is very close to the Waul's pelt, but the Ebrevoor has two 'eye spots' on it's back.
Brown face, no nose

Waul - Huge tusks on cheeks ( I think?)
It's a pity that a creature that has been sent out twice with the direct instruction 'make sure Brose sees you' is still something you've not encountered. The Waul Costume is: Red/Orange face with spots, no whiskers, pink 'kitty' nose, one bladelike tusk on each cheek, and special 'Waul' pelt - same fur color as the Ebrevoor.

Zeethra - Looks just like an ursuja, but has a whole lot more confidence?
I am told by persons less colorblind than I that the Ursuja are BROWN bears, and the Zeethra are BLACK bears.

Spiders - Black face with red spots.
There are actually more than one spider type, but the makeup is essentially the same. Generally speaking, if the spider is in makeup, then it is pretty nasty. If it is wearing a mask, it's nastier.