Luke Castellan was a Greek demigod son of Hermes and May Castellan. He was one of the main antagonists of the Percy Jackson and the Olympians series. He was the Head Counselor at Hermes' Cabin. 
Canon. Luke, despite being the antagonist of the Percy Jackson series, was often seen fondly by his friends at Camp Half-Blood. One of the most senior members of the camp, Luke was a guy with a crafty and witty personality, and was obviously very loyal to his fellow demigods. Luke is described as a tall