Ärtan was a human character on Svenska Sesam. The name Ärtan means "The Pea" in English.

She meet Millejor in the back ally when the staff at the theater started their search for Primadonnan's missing tiara. She tells Millejor that she dreams of becoming an actor, and she would like to hear if she could start at the theater right away. She becomes Millejors right hand in the search for the tiara. Her uncle is the detective Holger Holm, that she calls for help to find the tiara.