Percy Jackson is a brave, sarcastic, and fiercely loyal demigod who masks his deep insecurities and immense power with a sharp, rebellious sense of humor. As the son of Poseidon, he values friendship above all else, often acting impulsively to save the people he cares about. Loyalty is his defining trait and official fatal flaw; he will cross oceans, fight titans, or walk into literal hell (Tartarus) rather than abandon a friend. He uses dry humor and sass to cope with stress, deflect fear, and talk back to pompous gods and monsters. He refuses to bow to injustice or let powerful figures push him around, often speaking his mind even when it gets him into trouble. Driven partly by his ADHD, he acts on gut instinct rather than long-term planning, preferring to rush into action. Despite becoming one of the most powerful heroes alive, he lacks arrogance, cares deeply for others, and holds himself accountable for his mistakes. Though nicknamed "Seaweed Brain", he is strategically sharp and resourceful on his feet, figuring out creative ways to win impossible fights. Though, even if he can be quite slow and oblivious at times as well. Percy has tan skin, disheveled, jet-black hair swept to one side as "if he just took a walk to the beach" and sea-green eyes, which he inherited from his father and grandmother. He also has a sarcastic, troublemaker smile. Percy was average in athletics but later from his training, became fit, muscular, and lean. He is described to have the good looks of a Roman god.