Grunkle Stanford Pines, often shortened to Grunkle Stan to the Pines twins and Mr. Mystery to various tourists, is a greedy, selfish, but well-meaning and a man with good in his heart. Stan runs a tourist trap known as The Mystery Shack and is a professional conman. However, Stan is not all that he seems to be, and spends a lot of his free time working on somthing big that can either help or destroy mankind.
- In Gravity Bound Stan and Waddles are the only non-playable characters that the player can name.
- He is also one of the few non-playable characters to appear in every chapter.