Mightyena is based on a hyena. Its body is a mixture of black and grey coloured fur, with black coloration on its lower legs, clawed feet, and tail. Mightyena has dark, triangular streak patterns below its eyes, which have yellow scleras and red irises. Mightyena has rhombus-shaped ears with dark insides, grey paw pads, and noses that are red in coloration. It has eyebrow-like extensions on its head from the black, shaggy "mantle" of fur on its back.