Janus Tartaglia is a college student in an unknown university who joined the subversive organization known as the Laniakea. He carries a rocket launcher which was provided by the organization's leaders.
His Above and Beyond counterpart is Juliet Tartaglia.
At some point in 2018, Janus Tartaglia enrolled in Philippine Science High School's Main Campus.
Janus was first seen with Sinope during a bottle rocket contest. Before that, he was recruited to a team that would later be known as the Laniakea, and was given a special rocket launcher. He later joins the school's team for the 100th International S.T.E.M. Olympiad, along with several others, helping recruit Arturio during their excursion, and even testing out a gadget with his friends at the beach.
Janus attends the batch's Graduation Ball after he graduates high school. During the ball, he loses his memory due to the cataclysmic result of Sachikayla and Tyriann's falling out.
To be added
Janus is very cautious and trustworthy, and can be relied on to keep secrets, though if any secrets are threatened, he'll make sure they'll be safe no matter what happens. He is extremely loyal to the Laniakea primarily due to the L.E.N.S.es affecting his mind, though the incident at the Graduation Ball has changed that momentarily.