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Grampu is a main character in the Oobi television series.
Grampu is Oobi and Uma's grandfather. Although he always has his hands full taking care of the kids, Grampu is quite a laid-back character. He often comes up with ways to bond with Oobi and Uma, whether it is on a grandfather and grandson fishing trip or a nature walk in the state park. His catchphrase is "Lovely," which he uses to describe much of what the children show him.
- Grampu is performed by Tyler Bunch.
- In the "Grampu Day!" episode, an old family photo shows Grampu with dark hair.
- It is revealed that Grampu has visited St. Louis in the "Chez Oobi!" episode.