He carries himself with the pomp and dignity one would expect from someone who fancies himself a centurion, while also maintaining the air of a seasoned warrior, even from under his heavy environmental suit. He is a commanding presence and is not afraid of being confrontational. He does not wield a shotgun like his soldiers, but he does carry a .45 caliber revolver which he is very capable of using.
Caius will not have much to say to the Prisoner, unless the Prisoner has been to the Twin Mothers and dealt with the raiders there who have an interest in Caesar’s Legion. Caius will be blunt and tell the him/her to mind his own business unless the Prisoner knows of a viable supply of fresh slaves which he and his men can retrieve.
Caius Drusus has not appeared nor is he mentioned in any published game. He was to appear only in Van Buren, the canceled Fallout 3 by Black Isle Studios. It is not certain if he will appear in any future Fallout game.