Khalil is a half caterpillar and half worm. He has black hair, black eyes, and a black mustache. His body is blue-pale, and he wears a red vest.
Khalil is based after the worm who ate the plant God gave to Jonah when he watches over Nineveh. Phil's original concept of Khalil was to be just a worm like in the original story, but disliked it after seeing concept art as he looked too much like a snake. So they changed it to a caterpillar, though they kept the worm concept as he's a hybrid.
- He is the first character to have colored irises.
- He is the first recurring character to be introduced in the movies.