Being from the race of Overlords he is described as an intelligent, smart, and friendly guy. Unfortunately, Karellen knows what will happen to the human race, and has strange dual feelings about it. In this story he has some talks only with the Stormgren, and honestly, they are very sincere to each other and their friendship. He works for another group called the Overmind, as like the other Overlords do. Most humans know Karellen as the “Supervisor”: in other words, the one who knows everything. Like all Overlords, he is much taller and stronger built than any human. He has large wings, horns on his head, and a barbed tail.