Cliff is a minor character on Oobi.
He is most likely coworkers with the unnamed delivery woman, since they both work for the postal service. He only appears in the "Valentine!" episode, where he delivers a card to Oobi and Uma from their "secret valentine." Cliff seems to be a good friend of Grampu.
Cliff is a hand puppet with tanned skin, dark brown eyes, and a tuft of grayish-white hair. Unlike most of the characters on the show, his eyes are on the side of his hand, making him look similar to the thumb puppets of Señor Wences. He wears a blue mailman's coat with buttons down the sleeve and a small hat that matches his outfit.