Octavian was a Roman legacy of Apollo and the Augur of Camp Jupiter. He was one of few people to supposedly have the gift of prophecy. Octavian was also a centurion in the First Cohort.
Reyna Avila Ramírez-Arellano tells Hazel Levesque that after she questions Percy Jackson, she will send him to Octavian who will consult the Auguries and decide what to do with him after conferring. Percy describes Octavian as a "teddy bear murderer", as he saw many shredded teddy bears, and as Octavian tore apart his "Pillow Pet"
The first time Octavian meets Percy is at the Temple of Jupiter Optimus Maximus. Percy quickly learns that he is blackmailing Hazel into voting for him in the upcoming election for the Praetor, as he either found out about her raising Alcyoneus and being brought back from death.
Later during the war games, he is suspected of killing Gwen by spearing her from behind possibly after the games were already over. Frank Zhang notes that Octavian was the only one without a pilum and was at Gwen's back when she was stabbed. Gwen returns from the dead, claiming that she saw a man who was asking for a coin , but she just left. Frank pulls the pilium out and the wound heals automatically.
Mars appears on the field a moment later to issue a quest, saying that his son, Frank, will lead it. He also orders Percy to go for the quest to learn to have some respect for Mars. Octavian claims that they need a prophecy and states that he will go fetch his stuffed animals for one. Mars simply writes down a prophecy. The prophecy is extremely blunt and Octavian protests, declaring that prophecies must be wrapped in riddles. When Mars pulls a grenade from his belt, Octavian quickly changes his tone and treats the order as an actual prophecy.
The second time he is seen is during the Senate meeting where he convinces the others into trying not to give Percy, Frank, and Hazel supplies on their trip, as that is the traditional Roman way. However, Reyna allows them to use the The Pax for their quest.
After the battle against the Giant Army, Percy is raised on a shield as the Roman campers chant "Praetor", electing Percy to the position, much to the irritation and unhappiness of Octavian. At the Feast of Fortuna, he gives Percy his tattoo, but whispers to Percy that he hoped it hurt. He later claims that Camp Jupiter will have good luck.
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