Rose Lalonde

tentacleTherapist is a friend of John Egbert who uses the pseudonym tentacleTherapist when chatting on Pesterchum. Her name may also be abbreviated by the chat client as TT. tentacleTherapist may be assumed to be female, as turntechGodhead referred to her as "she".

tentacleTherapist is a rarity among Pesterchum users in that she types with perfect syntax and capitalization. From her single appearance in the game, she appeared to have a mysterious ability to detect that John was wearing a ridiculous disguise while messaging her; this may be foreshadowing of a plot point later on.