Simeon has a calm demeanor, to the point that Satan states in one of his home screen dialogues, "Wouldn't you be curious to see what Simeon's like when he's angry?". He presents himself as a nice and always smiling person, no matter if he's talking with demons or humans. This was shown when he invited Mammon and Beelzebub on a camping trip. Despite his generally kind nature, he is a very strict but good supervisor.