Armadillomon lacks documented portrayal in "Digimon Adventure -Beyond-", but features extensively in other Digimon media such as "Digimon Adventure 02", "Digimon Adventure tri.", "Digimon Adventure: Last Evolution Kizuna", and "Digimon Adventure 02: The Beginning". In these series, he partners with Cody Hida (Iori Hida) as a Mammal-type Rookie Digimon. Recognizable by his sturdy carapace, he exhibits an easygoing, polite demeanor and occasional overenthusiasm. His combat techniques include "Scratch Beat", where he strikes with extended claws, and "Diamond Shell", curling into a ball to ram opponents.

As a descendant of an ancient species, Armadillomon uniquely performs Armor Digivolutions using Digi-Eggs. Key transformations include Digmon (via the Digi-Egg of Knowledge) for underground warfare and Submarimon (via the Digi-Egg of Reliability) for aquatic engagements. His standard evolutionary path advances to Ankylomon at Champion level, then Shakkoumon at Ultimate through DNA Digivolution with Angemon, and finally Vikemon at Mega level.

Originally sealed by the Digimon Sovereign Azulongmon in ancient times, Armadillomon awakened during the Digimon Emperor's conquest. Freed by Cody upon discovering the Digi-Egg of Knowledge, he dedicates himself to safeguarding both the Digital and Real Worlds. His lighthearted personality, conveyed through a Nagoya dialect in Japanese media and a Southern accent in English dubs, contrasts with Cody's seriousness.

For comprehensive details on Armadillomon's established appearances outside "Beyond-", refer to the cited sources.