|Voice Actor||Hirata Hiroaki (平田 広明)|
|Paul St. Peter|
Leomon is the first opponent of Deserted Island's Battle Arena. When the player meets him, he considers his mission to be destroying the Chosen Children. He uses the Gears of Battle deck, a Green/Nature and Black/Darkness deck with 3 attack, defense and evolution speed. Upon being defeated, he praises the player, and realizes that he should just focus on enjoying the game, asking the player for his help on that.
In-game, Leomon is shown with blank eyes, as he looked under Devimon's brainwashing.