Helios is a minor character in the series, and the Titan god of the sun. He is older than Apollo, who in mythology is the Olympian god of the sun, but Apollo is only mentioned as the godboy of truth in the series. He also has a few roles in the book Pheme The Gossip. He is not a teacher at MOA but is a friend of Zeus. Initially, everyone didn't believe Phaeton that his father was Helios.
Helios wears a yellow cape, and a bright yellow chiton. He is seen on the cover of Pheme the Gossip riding his sun-chariot while holding a torch.