Chilk was a resident and prankser of North Village and a friend of Numbo. He was sent to the Brain Coral's Pool for his pranks on Bink in A Spell for Chameleon. He later escaped in Up in a Heaval and had to be retrieved by the centaur Epi.
Chilk had the ability to create a temporary invisible wall. The wall could only be six feet square, but it was as hard as steel when first formed.