DeeDee
Dexter considers his sister Dee Dee to be stupid, clumsy, and inferior to him. This is ironic as Dee Dee tricks him repeatedly, with urban myths and false information about certain diseases. Dee Dee frequently succeeds in areas where Dexter fails; for example, she beats him in physical activities such as a snowball fight and basketball. On rare occasions when Dee Dee and Dexter work together, she shows affection towards her brother. Dee Dee continually destroys parts of Dexter's lab. Their relationship is a normal brother/sister rivalry rather than outright cruelty.
