Who is Tyson in the novel, The Tyrant’s Tomb?

Tyson is a cyclops who is always seen with Ella. His personality is the exact opposite of the harpy, as he is more simple-minded and always happy. He willingly allows Ella to tattoo his skin, and is especially excited to be useful. At the end of the novel, Tyson’s tattoo's helps lead Apollo and Meg back to Manhattan, where they will challenge Nero and Python for the final battle of their quest.