Merukimon

Merukimon is a powerful Digimon and one of the Olympos XII. He raised Keenan after the death of Keenan's guardian, Frigimon, and ruled over a portion of the Digital World from his palace, the Infinite Ice Ridge. He met Spencer Damon 10 years ago in the past, believing his words that humans and Digimon can co-exist. But his faith towards humans turned into animosity when a group of humans led by Kurata appeared in the Digital World and begun to delete Digimon. However, when the truth was revealed by Kurata himself, Merukimon decided to try believing in Spencer's words again, and sacrificed his life to save Keenan, Marcus, and the others.

Merukimon first appeared when he decided to go to the human world after learning that Falcomon had travelled there to find Puwamon. He arrived just in time to save Falcomon from GeoGreymon's Mega Burst attack. After been attacked by Marcus, Merukimon proceeded to defeat GeoGreymon, Gaogamon and Sunflowmon. He was also able to revert Biyomon (Puwamon's evolved form) back into a Digi-Egg.

Merukimon then tempered with Biyomon's Digi-Egg, attempting to 'purge' the human influence from it. He was unsuccessful, and the egg hatched again into Biyomon. Biyomon was now fixated on Kristy ([Marcus Damon's sister). Biyomon then Digivolved into Aquilamon and escaped to wreck havoc in the human world. DATS discovered Merukimon's signal mixed with Biyomon's data, leading DATS to believe that Merukimon is responsible for breaking down the boundary between the human and Digital Worlds. Marcus and his group was sent off to investigate and put an end to Merukimon.

Cherrymon reveals that Merukimon and those working for him entered the Real World via the Digital Gate located within Merukimon's palace. Although Merukimon was warned by his minion Gotsumon, he did not regard the DATS members as a threat. Merukimon easily defeats the DATS Digimon, but before he can finish them off, he sees Commander-General Yushima, another familiar face. Yushima and Gwappamon hold Merukimon at bay while the others escape. After that, Gotsumon tries to convince Merukimon that Keenan is a traitor and that he and the Humans must be destroyed. However, Merukimon refuses to believe Keenan actually betrayed him and had no intention to attack the humans. This resulted in SaberLeomon deciding to take matter into his own hands, with Gotsumon leaving Merukimon's side to aid him.

Merukimon eventually learned the truth of what truly occurred as Kurata used his Gizumon AT to perform a sneak attack on Merukimon, telling the Digimon that Spencer was a fool to trust Digimon. Gizumon AT became Gizumon XT, and Merukimon sacrificed his life to damage Gizumon XT to protect Marcus, Keenan, and the others with a renewed faith in Spencer's dream. Merukimon was destroyed in that battle, and so was his Digi-Egg.

Attacks
 * Thousand Fist: Uses a short and speedy teleport to get close to the opponent, then pours on a hyper-barrage.