Harley

Harley is an eight-year-old Greek demigod, a son of Hephaestus, and a camper at Camp Half-Blood.

The Lost Hero
Harley is first introduced when Leo Valdez visits the forges for the first time. The youngest member of the Hephaestus cabin, he is seen working along with his siblings to catch the bronze dragon, which is later named Festus (Latin for Happy) by Leo. Harley is affected by the so-called "Curse of Cabin Nine" at the time, which makes everything they build go haywire. At the only time he is seen, he is depressed because of the curse. He has many siblings, including Leo, Nyssa, Christopher, and Jake Mason. Leo comments that all of the kids in this cabin look different, saying, "You'd never think, 'Hey! It's the Hephaestus bunch!'"

Appearance
He is described as beat-up and depressed, probably because of carrying the weight Curse of Cabin Nine. Harley is also very strong, as he works on the forges. Leo describes him by saying that "even little Harley looks like he could probably go six rounds with Chuck Norris without breaking a sweat". Harley's hands are described as being large and calloused.

Abilities
As a child of Hepheastus, he has the following abilities:
 * He is an expert builder.
 * He is an expert mechanic.
 * Technokinesis: As a son of Hephaestus, he can control machines.
 * He can sense machines, mechanics, or metal.
 * He can identify machinery type and use by touch.
 * He can sense faults in metal ore.
 * He can find and sense traps in the ground.

Trivia
Harley
 * It is hinted that Harley is named after "Harley Davidson," the popular motorcycle company.
 * He is technically the youngest demigod to appear at a camp in either series.
 * Annabeth Chase was seven when she came to Camp Half-Blood but debuted at age twelve. Jason Grace was two when he arrived at Camp Jupiter but debuted at age fifteen.