In Never Ricking Morty, he appears as the conductor of the story train, beating up Rick and Morty and trapping them with the intention forcing them to live through anthologies as a way of using their marketability and entertainment value to power the train enough for it to break the fifth wall.
This fails however when Rick and Morty basically make themselves unwatchable by changing the plot into that of a child friendly christian show, there by ruining their entertainment value. Story Lord tries to stop them only to get trapped in the anthology himself with Jesus Christ as Rick and Morty escape.
He is later seen walking with Jesus on a beach. After Story Lord explains the origins of Christianity to Jesus, Jesus decides to self-destruct, presumably killing Story Lord.
Story Lord appears to be human. He has gray hair, signifying his age and is incredibly shredded, possessing bulging muscles and a six pack.