Kartos is a large, wooden minecart who will ask Yooka and Laylee to collect a required minimum threshold number of Gems in exchange for a Pagie known as The Kartos Challenge. The required number of Gems will vary per world. Kartos has been out of work for some time before meeting the duo.
The name "Kartos" is a reference to what he is: a minecart. It is spoof of the name Kratos, the main character in the God of War franchise.
Kartos is a mine cart made out of wood and steel. The bright head lights on the cart act as Kartos' eyebrows. He sports a wooden mustache. His jaw is relatively big and moves around when he talks. He has coal inside of him.