Dylan

"I'm Dylan. I'm so cool, I want to date myself, but I can't figure out how! You want to date me instead? You're so lucky!"

- Leo Valdez, mockingly imitating Dylan

Dylan is a monster (storm spirit; ventus) posing as a boy who is partners with Piper on the field trip from Wilderness School to the Grand Canyon and the Grand Canyon skywalk. Dylan was born when the Titan Typhon was defeated by the gods in the Second Titan War.

In the Lightning Thief movie, there is a camper at Camp Half Blood named Dylan. He was mentioned at the end of the movie by Chiron, when he was been trained.

The Lost Hero
Dylan takes Piper as a partner unwillingly at the Grand Canyon. When the storm arrives, he transforms into a Ventus, a storm spirit, son of Typhon, and pushes Leo over the side (Coach Hedge saves him) blasts Jason's shoe off with lightning. He is shocked since the blast could have killed 20 men. Although Jason battles Dylan and wins, Dylan escapes them and takes Coach Hedge, Piper, and Leo's satyr protector. In human form, he is described as having a smile so bright that they should come with a warning label, a cowboy's jersey, and dark Superman style hair.

He says "The mistress calls me back" which implies that he works for a goddess who Jason, Piper, and Leo find out later on that it is Khione, the snow goddess and the daughter of Boreas, the North wind. Dylan knocks Piper (Jason saves her) over the Grand Canyon skywalk and captures Coach Hedge. It is later revealed that he works for Gaea, Mother Earth.