There are going to be two teams on the battlefield:
Team Orion:
Orion: The leader of his team.
Nova: The right hand of Orion, and 2nd in command.
Alex: The left hand of Orion, and 3rd in command.
The Other Characters: The real players in Eternum, such as Jerry, Raul, Noah, etc.
The Army of The Syndicate: The members of The Syndicate organization.
The Army of The Roman Empire: The United Armies of Eastern Roman Empire, Western Roman Empire, and Macedonia.
Nancy: The leader of The Roman Armies and the strategist of the team.
The other characters like Jerry, Raul, Noah, Eva, Maat, Kitty, Megan, Balbus Bundledore, and the Professors of Warthogs are going to fight the NPCs. I think it is safe to say that we may consider the excommunicated players by the praetorians as the NPCs, too