Atiris is a typical mustang in form and colouration, sporting a stocky, powerful build, perfect for the rugged terrain and defending herself. She has thick, muscled legs, and a short, heavy neck, hindquarters bunched with sinew and hooves that are small but hard and clever.

Her hide is the colour of corn, a gleaming golden hue, but her mane and tail are the shade of raven feathers. She has a dark beige dorsal stripe and faint zebra markings that creep up her hind legs from her dark socks. Her mane and tail are exceptionally long, as is her forelock, and are often tangled and whispy.