Markus "Zarkus" Poussa is a Finnish musician. He has been a member of groups Giant Robot, RinneRadio, Hemma Beast and Anna-Mari Kähärän Orkesteri. He is known of using a lot of humor in his songs and performances. He is also the musician of television show W-tyyli. In 2007 he appeared in Jokainen vieras on laulun arvoinen.