Dr. Giovanni

Battalion Commander of the Special Fire Force Company 3 → Adolla Cult Faction. A mysterious figure wearing a plague mask.

Connected to Haijima Industries, but is actually a member of the Adolla Cult Faction. He is cautious by nature, but becomes extremely agitated when unexpected events occur.

A second-generation pyrokinetic who fights using flame-controlled mechanical arms. He has repeatedly used his own body as a test subject for human experimentation and mechanization, acquiring various functions with each appearance. He has conducted affinity experiments with Adolla bugs, gaining insect-like abilities such as "dragonfly compound eyes," "moth hair pencils," and "rove beetle gas."

He was one of Vulcan's grandfather's disciples, but joined Haijima Industries shortly after Vulcan's grandfather and father died from turning into Infernals, seemingly betraying his master. He frequently approached Vulcan aiming for the key to Amaterasu, putting pressure on him, and even plotted his murder after being rejected, leading to combat with Company 8. He later acts covertly as a member of the Adolla Cult Faction.

His true form is a bug, and during the battle for Amaterasu, he is defeated by Vulcan and others. However, he successfully triggers a disaster by locking Yu's body, which he had taken over. Eventually, he completely takes over Yu's body, but meets his end being burned to death by an enraged Arthur.