Stanford Pines is the great uncle of the Pines twins (who affectionately reffer to him as "Grunkle Stan"), who is a permanent resident in Gravity Falls and owns the "Mystery Shack"- a museum of fake horrors and supernatural objects. He's cranky, greedy and sly, but values his neice and nephew- to the point he denies any supernatural goings on to protect them.

However, he is not what he seems: He has many different identities, each with different names and appearances: He's trying to hide something, but what, is unknown.

He is seen to have his own version of the journal, which he then uses (with the other two) to build a dooms day device.