Warren Ampersand

Warren Ampersand the Shape-shifter is a creature seen in "Joshua and Margaret Investigations." He is a shape-shifting extra-dimensional alien being that infected Joshua with his venom, causing Joshua to develop a large boil on his head from which Jake emerged. Warren technically is the biological parent of Jake, which Jake eventually learns later. Tree Trunks mentioned to Joshua and Margaret that the creature had touched her and several other citizens of Ooo on the shoulder, and it cackled knowingly before opening a portal and returning to its homeworld, suggesting that it might have been seeking to create some sort of hybrid offspring on this world, the result of which was Jake. Warren resided in the Pantheon of Savings when he was not on his "homeworld." Jake formally meets him at the end of "The First Investigation," during the time he witnesses his own birth. and learns that Joshua is his "mother", while Margaret is his adoptive mother. This continued into "Jake the Starchild," in which Warren introduced himself, and transported his son to his home world. Upon arriving there, Warren revealed to Jake that he was dying. Warren showed Jake a museum he made in his honour and revealed he had been watching over him for years. Jake later found out, that Warren had only brought him to his world to absorb Jake's powers, eventually killing Jake as he had done so with his many other offspring. By the end of the episode, Warren decided to do the same to Jake's children but was thwarted by Jake and thrown into a black hole.