Caeso is a small, 4'6" and 70 lbs, cat Therian. His Therian heritage can be seen in his yellow feline eyes and cat-like ears on the top of his head. The ears are a dark bluish grey, as is his hair. His skin is well tanned from time spent outside (and perhaps a lot of some sunbathing on the roofs).

Clothing-wise, he has two outfits worn on different times of day. At daytime, he wears a long jacket, nice boots, and a flat cap to hide his ears. All of them are varying shades of tan leather. They give him the look of perhaps a burghers kid.

At night, at least on the job, he wears a set of leather armor, painted similarly to his hair as it has proven a good shade to hide in the night. The armor is also usually worn under his day clothes if it's cold enough to keep the jacket closed.