Leo Valdez is a fictional character and one of the main protagonist of Rick Riordan's The Heroes of Olympus series. He first appears in The Lost Hero where he is a fifteen year-old demigod of indeterminate parentage who attends the Wilderness School, a boarding school for "bad kids".
After an attack by a group of storm spirits, Leo learns that he and his friends, Jason Grace and Piper McLean, are demigods. The three of them are then escorted to the demigod sanctuary of Camp Half-Blood. He is soon claimed by Hephaestus upon arriving.
