Upsilonmon is a Warrior Digimon whose name is derived from "Upsilon." One of the "Lost Knights", it was fused from VictoryGreymon and ZeedGarurumon due to the pride of those in the real world. It is a Digimon who has combined the special qualities of two bodies, so it is a multitype warrior which can fully demonstrate those abilities, for any given situation. It is equipped with the "Victory Sword" and "Brave Shield Upsilon" for its VictoryGreymon-shaped left arm, and the "Zeed Cannon" and missiles for its ZeedGarurumon-shaped right arm. As for the mantle on its back, it is automatically deployed when it dodges an opponent's attack, or when it is flying. Like LostShoutmon, upon whom it had bestowed the legendary "Digivolution", it possesses the power of "Upsilon InForce". It bears the Crest of Victory on the Brave Shield Upsilon, and a combined symbol of the Crests of Victory and Desire on its chest. The DigiCode on its Victory Sword reads (オールデリート Ōru Derīto?, lit. "All Delete"). Unlike Omnimon, its purpose in fighting is for the reward, not for the honor, and it will do anything to secure its prize.
- Upsilon Cannon (Zeed Cannon): Freezes the opponent with frigid, absolute zero shots that it fires from the "Zeed Cannon".
- Pride's Blade (Victory Sword): Slashes with the invincible "Victory Sword".
- Double Shot (Double Torrent): Annihilates the opponent with successive shots of fire and ice from the VictoryGreymon and ZeedGarurumon heads.