Truffle (localized as Haxile in English releases) commands as a member of the Four Dark Warriors, also known as the Four Heavenly Kings, within the antagonistic Death Metal Empire. He masterminds operations as the faction's lead strategist, relying on cunning intellect and tactical foresight.

His primary Zoid partner is the Stegosaurus-type Bonesaw; he later commands the Dimetrodon-type Dimepulsar. Demonstrating considerable combat proficiency, he engages multiple adversaries simultaneously, notably battling both Salt (Apex) and Bastion (Gyōza) concurrently and coming close to defeating them. His strategic acumen includes deploying backup contingencies during missions, repeatedly preventing the complete defeat of his fellow Dark Warriors when confronted by Team Freedom or Team Supreme.

Within the Four Dark Warriors, he maintains distinct relationships, exhibiting persistent friction with Drake due to frustration over Drake's preference for solitary combat tactics rather than cohesive teamwork. This dynamic occasionally hinders their collective effectiveness despite his efforts to coordinate group strategies.

Visually, he is characterized by facial markings, facial hair, and a balding head. His Japanese name, Truffle, and English localized name, Haxile, reflect the faction's thematic conventions of food items and IT-inspired nomenclature respectively. His role remains consistently defined by his military function within the Empire's hierarchy and tactical expertise against opposing forces.