A Slendytubbies OC, Caplet is a second generation mutant of the Yeti category (consisted of thermal-based individuals with large size and thick, insulating fur) and the Clown category (recorded to be one of the most sentient mutants, featuring increased physical abilities and circus-themed appearance). 

Caplet is a very tall, muscular female mutant with black fur, a white countershade on her upper body, red gradient hair and ornamental shapes around her body, as well as menacingly sharp teeth.