In the first episodes of "Oobi", which were short two-minute stories, Grampu was a secondary character who did not show up very much. When the show was turned into a longer half-hour program, Grampu got a bigger role. The show writers used him as a (a contrasting character) to the kids, or as someone to give them advice. Grampu appeared more than he used to, and he was part of almost every single episode.