Cleopatra "Cleo" Lion is one of the main characters in the TV series. She is one of the lions running the library, the rest being her husband Theo, and her children Lionel and Leona. She is played by Jennifer Barnhart.
She acts as narrator during Albrecht Roser puppet segments and Hugo and Ines's otherwise wordless Teatro segments, as chef and recipe reader during her and Theo's What's Cooking? segments, and occasionally performs music as Tammy Lionette (a play on the name of country singer Tammy Wynette).