One of the 13 Holy Knight Digimon that are known as the highest-class of network security: the “Royal Knights”. Although a Holy Knight himself, his existence is described as like a restraining force against Holy Knights. A Royal Knight with fluttering dark-blue mantle found in a place named the “Blank Seat”, because he never appears in normal times he is described as an isolated hermit. In battle, although Alphamon’s offensive may make things end instantaneously, it is impossible to be certain how many strikes were performed, since in theory, because of the ultimate power AlphaInForce (a syllabic abbreviation of Alpha Gain Force) that allows him to momentarily take back a fight that has already occurred, it is possible that actually only the last attack that took down the enemy was perceived. By expanding the magic circles of DigiCode on both his hands he can perform offensive and defensive maneuvers. Special Moves are drawing from the light converged at the center of a magic circle his Holy Sword Gradalpha (derived from Grademon’s Twin Swords Gradalpha) and using it to pierce the enemy, and to summon a legendary monster from another dimension by spreading the wings in his back to fly and then expanding a magic circle greater than the sky (Digitalize of the Soul).

１３体存在すると言われるネットワークセキュリティの最高位、聖騎士“ロイヤルナイツ”の1体である。聖騎士でありながら、聖騎士への抑止力的な存在だと言われており、通常時は姿を現すことはなく、蒼いマントを翻す“孤高の隠士とも呼ばれ、“空白の席”と呼ばれる所に位置する“ロイヤルナイツ”である。戦いにおいては過ぎ去った戦いを瞬間的に取り戻す究極の力「アルファインフォース（最初Alpha 獲得Gain 力Force）」の能力を持つため、アルファモンの攻撃は一瞬にして終わるが、実際には何回の攻撃を繰り出したかは分からず、理論上、敵が倒れる最後の一撃だけを見ることになる。両手からデジ文字の魔方陣を展開して攻撃と防御を行う。必殺技は魔法陣の中心に突き刺さった光の収束を抜き、敵を貫く『聖剣グレイダルファー｛グレイドモンの「双剣グレイダルファー」に由来｝』と、背中の翼を広げて飛翔し、上空より巨大な魔方陣を展開して、異次元より伝説上のモンスターを召喚する『デジタライズ・オブ・ソウル』。