Grampu has gotten a good reception from viewers and critics. Many parents who watched "Oobi" with their kids thought he was the funniest part of the show. In an interview, Josh Selig said "many mothers seem to have developed a 'thing' for Grampu." , a writer of comedy books, called him "a hilarious character" in his book "Alternadad". He also wrote that Grampu seemed like a "children's TV character with whom we could spend an afternoon if [he] magically came to life."