Grandpa Lemon is one of the main characters in the Annoying Orange. He first appeared in the episode with his own name, but then got knifed and juiced. He was revived in the Frankenfruit episode, where he was part of the Frankenfruit monster. Then, after that, he eventually started appearing as a main character. Starting from late Season 2 (or early season 3) he rides a motorcycle. He usually sleeps in the middle of talking, which is trouble for the other person.
Grandpa Lemon is one of the three main characters who have been knifed but revived later in the series (the other two being Grapefruit and Apple). He is a founding father of The United Fruits of Amerifruit. He used to go by the name of Bejamin Franklemon, and it is revealed in Founding Fruits that he is over 200 years old. He first appeared in the episode Grandpa Lemon, where he and Orange were having a very odd conversation. Orange was trying desperately to annoy Grandpa Lemon, however all of his attempts failed, due to Grandpa Lemon's bad hearing and his sleeping disorder (which is so severe that he even fell asleep while getting knifed). Grandpa Lemon also has short-term memory loss (as revealed when he forgot Orange's name after getting juiced). Grandpa Lemon was revived in October of 2010. He, along with many other fruits and vegetables, were put together in order to form a creature known as Frankenfruit. Frankenfruit was controlled by Grapefruit for the sole purpose of getting his revenge on Orange, for "stealing" Passion Fruit and causing him to get knifed. However, Grapefruit's attempt for this failed due to the Halloweenie eating most of Frankenfruit. Grandpa Lemon was one of the foods to survive the blow (the others being Grapefruit, Gourd and Carrot). Since then, Grandpa Lemon has lived in the kitchen unharmed. As usual, he falls asleep, usually during crucial times, and has moments where he usually forgets things. He had also purchased a motorcycle which he still uses despite his advanced age. He, along with the rest of the gang, still finds time to go to the fruit cart with Nerville and some other fruits. During early 2014, Grandpa Lemon has moved out of retirement and landed a talk show known as Grinds My Rind, a show where he shares the downsides of modern technology. This can be seen on his Youtube Channel.