Alphamon (アルファモン) is a Mega-level, Vaccine attribute Digimon. It is one of the 13 "Royal Knights ," among the highest-ranking Digimon when it comes to Network security, and a carrier of the X Antibody. Its body is entirely clad in gold-trimmed silver armor, and has a triangular red jewel on its forehead.

Although Alphamon itself is a Holy Knight, it is said to act as a deterrent to others of its kind. It typically prefers to remain hidden, and is widely known as the Aloof Hermit, identifiable by the blue cape that flutters around it. The position it occupies as Royal Knights is known as the Empty Seat. Because it has the ability to access the ultimate power Alpha inForce, power that can instantly reverse what would otherwise be a lost cause, Alphamon’s attacks are always over in the blink of an eye. Actually, it’s never clear whether Alphamon is making one attack or many, as theoretically it’s possible that only its final blow was visible. It can also attack or defend by activating the magic circles of DigiCode on its hands.