Jason is a brave, disciplined Roman demigod and son of Jupiter who initially arrived at Camp Half-Blood with no memories. After learning the truth about his past, his identity as a Roman, and the conflict between the Greek and Roman camps, he begins reconnecting with who he was. With blond hair, blue eyes, an athletic build, and a scar above his lip, Jason carries himself like a natural leader. He can fly, control wind and weather, and summon lightning. Though he cares deeply for his new Greek friends, Jason ultimately returns to Camp Jupiter to help bridge the two camps.

Piper is a compassionate, independent Greek demigod and daughter of Aphrodite. She has long, wavy brown hair, warm brown eyes, and natural beauty. Piper dislikes being judged by her appearance and values genuine relationships. She is clever, brave, and fiercely protective of those she loves, especially Jason. Her charmspeak allows her to influence others through her voice, making her a powerful asset despite her relatively young experience.

Percy is a brave, sarcastic, and fiercely loyal Greek demigod, son of Poseidon. With messy black hair, sea-green eyes, and an athletic build, he is an experienced warrior capable of controlling water, breathing underwater, communicating with sea creatures, and wielding Riptide. After being missing, Percy is still central to the unfolding conflict, with his disappearance connecting the Greek and Roman camps.

Annabeth is an intelligent, determined Greek demigod and daughter of Athena. With curly blonde hair, stormy gray eyes, and an athletic build, she is a brilliant strategist and natural leader. Her greatest priority is finding Percy and understanding the forces threatening both camps. Though suspicious and stubborn at times, Annabeth is deeply loyal and willing to risk herself for her friends.

Leo is an energetic, sarcastic, and inventive Greek demigod, son of Hephaestus. With messy dark-brown curls, warm brown eyes, and a lean build, he often hides insecurity behind humor. Leo is a gifted mechanic who can build almost anything and possesses the ability to create and control fire. He is fiercely loyal to Jason and Piper and uses his jokes and inventions to keep everyone moving forward.

Nico is a quiet, mysterious Greek demigod and son of Hades. He has messy black hair, dark eyes, pale skin, and a slender build. Reserved and guarded, Nico possesses powerful Underworld abilities, including summoning the dead, manipulating shadows, and shadow-travel. He tends to keep his distance from others but remains deeply loyal to the people he trusts.

Hazel is a kind, courageous Roman demigod and daughter of Pluto. She has curly dark-brown hair, golden-brown eyes, and a graceful build. Hazel can sense and manipulate precious metals and gemstones, summon the dead, and influence the earth. Though haunted by her unusual past, she is compassionate and determined. Later on, she becomes an important part of the group surrounding Jason.

Frank is a gentle, loyal Roman demigod and son of Mars. He has short black hair, dark eyes, and a broad, muscular build. Despite being somewhat shy and insecure, Frank is a talented archer and warrior. His rare ability to shapeshift into different animals makes him especially versatile in battle. He is gradually growing into his confidence and place within Camp Jupiter.

Reyna is a strong, disciplined Roman demigod and daughter of Bellona. With long dark hair, dark eyes, and an athletic build, she carries herself with authority. As Praetor of Camp Jupiter, Reyna is responsible for protecting the legion and maintaining order. She is an exceptional warrior who can sense the abilities of others and draw upon their strengths. She respects Jason but understands the dangers facing both camps.

Octavian is an ambitious, calculating Roman augur and descendant of Apollo. With blond hair, pale skin, and a slender build, he presents himself as respectable and intelligent. He is deeply devoted to Roman traditions and suspicious of the Greeks. Politically manipulative and hungry for influence, Octavian sees the growing tensions between the camps as an opportunity to strengthen his own position.