Pan (パン) is the granddaughter of the main character Goku. Pan's heritage is primarily Human, being the offspring of the Saiyan-Human hybrid Gohan and the pure Human Videl, thus making her 1/4 Saiyan. Pan is introduced at the end of Dragon Ball Z, and only appears in the written series for a few chapters in the manga. Her role is extended into the anime-only series Dragon Ball GT when it aired in February 1996, which takes place several years after the end of Dragon Ball Z. She is the last member to "join" the Z Fighters as she fights along side and supports the others against the enemies within Dragon Ball GT.
It should be noted that Pan's name comes from the Pan of Greek (as well as others) mythology. That means that, at first glance, she appears to have been named after her mother Videl rather than her father Gohan. However, closer inspection reveals a double-pun on behalf of author Akira Toriyama, in that Pan is also the Japanese and Spanish word for bread, continuing her father's food-based name as well as her mother's religion-based name. There is also a type of instrument called the pan flute, which implies that she was named to honor Piccolo, Gohan's first mentor and one of his closest friends.