Dorulumon is a prominent character from the anime Digimon Fusion. He is a proud and powerful Beast Digimon whose appearance resembles a large white wolf or lion, distinguished by an orange mane, a yellow drill on his forehead, and additional drills on his thighs and tail. His body features exhaust ducts on his shoulders, chest, and thighs, giving him a mechanical, vehicle-like aesthetic that complements his speed and combat-focused design.

Originally, Dorulumon served as a high-ranking officer and the right-hand man to Tactimon in the Bagra Army, the primary antagonistic force of the series. In this capacity, he participated in the destruction and subjugation of numerous Zones. His defection from the army was triggered by a mission where his superior ordered a raid that would decimate their own forces as part of the attack. Disillusioned by such ruthless tactics, Dorulumon disobeyed and managed to save a single Digimon, a BlueMeramon, before fleeing. Following his desertion, he gained a traveling companion in the small, healing Digimon named Cutemon, for whom he developed a strong protective instinct.

In terms of personality, Dorulumon is characterized by a strong aversion to being bound by rules or orders, a trait that stems directly from his traumatic past in the Bagra Army. He is often serious, irritable, and initially aloof, preferring to act alone and displaying a marked distrust towards others. His pride can sometimes make it difficult for him to accept help. Despite this tough exterior, he is deeply loyal and protective of those he considers friends. He shares a particularly close bond with Cutemon, whom he looks after with great care, and he can show a kinder, more compassionate side in private. He dislikes being referred to with demeaning nicknames like doggy or puppy.

Dorulumon's role in the story begins as a reluctant ally to the protagonist Mikey and his team, the Fusion Fighters. He saves Cutemon and a team member early on and later performs a DigiFusion with Shoutmon and Ballistamon to form the powerful Shoutmon X3 to defeat a common enemy. Although he leaves the group shortly after this battle, he continues to provide assistance during subsequent conflicts in different Zones. The Fusion Fighters repeatedly offer him a place on the team, but he refuses each time due to his trust issues and the weight of his past. His history is publicly revealed by Tactimon, but Mikey's unwavering trust in him, coupled with the desire to honor the sacrifice of BlueMeramon, ultimately convinces Dorulumon to officially join the Fusion Fighters.

Throughout his development, Dorulumon transitions from a solitary drifter burdened by guilt and cynicism to a committed member of a team. A pivotal moment in his arc is the understanding that he can trust his new friends unconditionally. When he expresses fear that he might betray them, Mikey famously responds that if it is to save a friend, Dorulumon can betray him anytime, a sentiment that stands in stark contrast to the rigid and unforgiving code of the Bagra Army and helps him overcome his hesitance.

Dorulumon possesses a variety of notable abilities that leverage his drill-based anatomy. His signature attacks include Drill Buster, where he fires the drill on his forehead with precision, and Dorulu Tornado, which enlarges the drill on his tail to create a powerful tornado that can strike both ground and aerial opponents. One of his most significant abilities is transforming into Bombardment Mode, or Dorulu Cannon, a powerful artillery form. However, this technique requires him to concentrate fully, leaving his defense at zero, so it necessitates the absolute trust and cooperation of a partner like Shoutmon to aim and protect him during the attack. He is also capable of performing DigiFusions with other members of the team, not only forming Shoutmon X3 but also contributing to more powerful combined forms like Shoutmon X4.