Daughter of demeter

Like Meg, his biological family was killed by Nero and he was taken in by the god emperor

Only he was blood related to the emperor. Distantly, very distantly, but it was relation enough and would grow up considered his son, and being a descendant of Apollo with the gift of future sight made Nero very interested in securing the young boy to his side.

The two-sidedness of Nero would cause Octavian to learn fast what strings to pull, how to pull them, and when to pull them. He learned as a defense against Nero, to play the abuser. He would grow into a manipulative bastard focused solely on himself in order to survive, as going with the flow would get you drowned.

Got to New Rome at age 11 and was more than thankful about it. With his father pulling strings behind the scenes, he had reached political positions in New Rome at a strikingly young age, but he succeeded at his positions.

When his powers went haywire, he essentially lost it. While he wasn’t a heroic, pure, knight in shining armor figure before, his paranoia fueled delusions caught up to him. While he was once an alright guy who just knew how and when to play his cards to turn a situation favorable for himself, who definitely had flaws galore, he became obsessed with his powers, as Nero always held high emphasis on it and how that gift would be so powerful to use, became obsessed with the idea of everyone turning against him- being roman through and through and related to emperors, it was a fear almost written into his DNA. Every ounce of fear he held consumed him when he could no longer see what the future held in store.

He survives the onager thing. Yeah that was dumb. Nobody can find his corpse so they assume he died, and he did for a short time, but Nero had made a deal with Mania and Libitina to bring him back once - and only once. No more after the deal had ended, but one resurrection was all he needed.