Cletus and Gus are two monster best friends who live somewhere in June's neighborhood and visit the kids often whether they have a magical or mundane problem. They are usually invited to group monster parties or gatherings at the Lee household as well, and both seem well-informed on monster history and customs. Gus is the smarter of the two and sometimes speaks in more unusual or sophisticated terms. Cletus has attention and memory problems and likes snacking on anything. Both enjoy watching monster wrestling matches on television.
They both have wives and kids who appear in "It's the Great Pumpkin, Juniper Lee".