Vulcan Joseph serves as Company 8's engineer, initially working solo due to deep distrust of fire brigades linked to Haijima Industries. This resentment stems from childhood trauma; Haijima recruiter Giovanni suspiciously turned Vulcan's father and grandfather into Infernals, leading Vulcan to blame both for their deaths. He possesses an athletic build, short red hair with shaved sides, and blue eyes. Striped tattoos mark his body: two black stripes encircle his neck, three horizontal stripes adorn each shoulder, two appear on his upper arms, and one stripes his left forearm. While working, he dons an eerie ram skull mask with twisted horns and goggles, dark trousers, a toolbelt, thick gloves, and boots. His casual wear often features animal-themed shirts, notably one emblazoned with "THE ANIMALS" and a black paw print. Vulcan combines intense passion for engineering with a fierce commitment to preserving life, especially animals. He dreams of creating a new energy source surpassing Amaterasu—one capable of reviving extinct species without exploiting human lives like the First Pillar. This vision fuels his insistence on independence from established organizations. He exhibits stubbornness and directness but unwavering loyalty to chosen family. His engineering philosophy involves rigorously testing inventions by smashing them to ensure reliability, asserting true faith resides in people and animals, not machines. His technical expertise designs and maintains Company 8's gear, including Maki Oze’s Iron Owls. Though not pyrokinetic, his physical training allows combat participation using creations like the flight-enabled "Penguin Helmet" ramming device. After Company 8 protects him from Haijima, he joins their ranks, forming close bonds with members like Shinra Kusakabe and learning to manipulate Arthur Boyle’s knightly delusions tactically. His relationship with Lisa Isaribi evolves significantly. Initially, she infiltrates his workshop as "Feeler," a White-Clad spy for Giovanni. Despite her betrayal, Vulcan recognizes her victimhood under Giovanni and protects her during Haijima’s assault. His forgiveness and insistence on her inherent goodness catalyze her defection to Company 8. While the manga depicts trust-based camaraderie, the anime amplifies romantic undertones through scenes implying jealousy and mutual affection. Key story arcs highlight his development: - In the Netherworld arc, Giovanni forces Vulcan to shoot Captain Akitaru Ōbi to save Lisa. Vulcan outmaneuvers Giovanni by equipping Ōbi with a bulletproof vest beforehand, then rescues Lisa after Giovanni abandons her. - During Ōbi’s Rescue arc, he participates in liberating the captain from the Tokyo Army, accepting traitor status with Company 8. - Following the second Great Cataclysm, Shinra Kusakabe’s reality manipulation restores Vulcan to life after his apparent death. Trivia notes include his name alluding to the Roman god of fire and forging, while his shoulder tattoos resemble characters from Atsushi Ōkubo’s *Soul Eater*. His rejection of Holy Sol teachings is implied through his family’s Amaterasu legacy and fearlessness in the Netherworld.