Eddo was a hand puppet/dummy that Eddy created to try to entertain Sarah with a joke in "Sir Ed-a-Lot." The joke went as follows:
- Eddy: "Say, Eddo, what's a ghost's favorite lunch meat?"
Eddo: [voiced by Eddy] "Boo-logna!"
His physical appearance was intended to resemble a miniature version of Eddy (e.g. the three nails on his head to represent Eddy's three hairs). He makes another appearance in "The Good Ol' Ed" when Ed put him in the Time Capsule. According to an interview with Scott Underwood, he stated that Eddo was his idea.