Jason Grace was the Roman demigod son of Jupiter and the late Beryl Grace, as well as the younger brother of Greek demigod Thalia Grace. Jason was a praetor of the Twelfth Legion at Camp Jupiter until he gave his rank to Frank Zhang during The House of Hades as a field promotion; he was the former head counselor of Cabin One at Camp Half-Blood and the Pontifex Maximus at Camp Jupiter. Jason Grace was a very responsible, kind, and open-minded person. Since he was not given a point of view until The Heroes of Olympus, much of his retroactive personality and quirks must be deduced from his memories and friendships but it was the general consensus that all who knew him thought him to be a very honorable and selfless person. Much of Jason's personality derived from how his parentage caused him to be placed on a pedestal. On the outside, a lot of people initially regarded Jason as too perfect and straight-laced, with Reyna even thinking of him as the perfect 'all-American boy.' Due to the duality of Hera's scheme to join the camps, Jason was often seen as the opposite of Percy which causes people who really like Percy (like Annabeth and Hazel) to initially dislike/distrust Jason. In actuality, Jason was more similar than dissimilar to Percy. As centurion and then praetor, Jason mentions that there were multiple times when he chafed against the stringent rules and expectations of the legion. Although Jason followed rules and obeyed authority most of the time, he was actually a staunch proponent of change whenever he noticed someone was being treated unfairly. This can seen when he stood up to Zeus and called him 'unwise' for blaming the entirety of the Gaia crisis on Apollo; or again when he dedicates himself towards giving minor gods the respect and recognition they deserve.Jason had a tough time figuring out who he was and who he wanted to be. He came to resent being a son of Jupiter and thought his parentage was trapping him into a destiny he couldn't control - he hated that he was forced to be a leader, and treated like a prince-in-waiting. Jason's stay at Camp Half-Blood was quite transformative for him and without the pressure of the legion he becomes much more laid-back and introspective. He begins to break rules and crack jokes. He even allows his hair to grow out and become messier. Even though he enjoys his time there, it causes Jason to have an identity crisis because he feels as though he was betraying his roots and the people who have for so long followed him and given him a home. Jason thought he solved it by deciding to be Greek and resigning as Praetor in the House of Hades