Jekyll is a gargoyle with features similar to that of a housecat and bat. They have a wolf cut/mullet with purple and blue racoon tails, different on each side. Their eyes are heterochromatic, similar to their antennae and wings. Their irises can be any shape, ranging from spirals to stickmen. Jekyll's antennae and wings are made of a shiny, jelly-like substance. They have 3 beauty marks on their face, two on either side of their mouth, and one below the right eye. Their ears and tail are striped in the same colour as their wings and antennae, their tail alternating the colours while their ears are only one. They always have their nails painted, each hand being a different colour. Jekyll's build is semi-chubby, though it's usually hard to tell under their baggy clothing. They have several spots throughout their fur, some shaped like hearts.

Jekyll usually has their oversized hoodie and big boots on. Their hoodie mirrors their eyes, the pattern in the centre able to be anything, including text. Their boots have pins in the bottom, they frequently swap them out, but they almost always have a large batman one in one of their boots. They wear biker shorts under their hoodie, but it's usually too large to see them. Jekyll likes to stick things to their legs like googly eyes and stickers. They occasionally are seen with a purple collar around their neck, though they don't always have it on. The collar has spikes on it, the spikes being various colours.