Karim Fulham commands as a lieutenant in the 1st Special Fire Force Company, holding the dual rank of priest and Second Generation pyrokinetic. His unique ability, "Thermoacoustic Refrigeration," transforms heat into sound through specialized instruments, generating ice for combat or containment—a process mirroring air conditioning mechanics. Precision control allows him to craft air pockets for rescue operations or quell raging infernos. Physically, he boasts cropped dark grey hair with shaved sides, narrow dark eyes frequently sharpened by irritation, and a muscular frame. His uniform blends a dark cassock with a light, high-collared overcoat and a cross-shaped pendant, diverging from conventional firefighting attire. Mission-ready, he dons headphones and wields instruments as extensions of his power. Personality-wise, he exudes stern caution, distrusting strangers with brusque or cutting remarks. A habit of reiterating phrases with slight tweaks occasionally clouds communication. Yet beneath this abrasive exterior lies unwavering loyalty to allies, strict adherence to protocol, and a sharp strategic mind—traits showcased when orchestrating anti-sniper tactics or deceptive maneuvers against foes. His past intertwines with Rekka Hoshimiya and Foien Li, close comrades in Company 1. After Rekka’s betrayal as an architect of artificial infernals, Karim confronts and encases him in ice. Rekka’s assassination by the White-Clad plunges Karim into guilt, fueling self-doubt over his oversight and role in the tragedy. This drives him to ally with Company 8, seeking truths about the Evangelist’s conspiracy behind human combustion. In later arcs, he collaborates with Hibana and Konro Sagamiya, exchanging intel on the Evangelist. During St. Raffles Convent’s infiltration, he confronts Sister Sumire, uncovering Fire Bug experiments and doppelgänger schemes. The mission costs him his instrument and nearly his life when facing Sumire’s Adolla Burst powers, survival secured only through allied intervention. Leonard Burns’ presumed death spurs Karim to grapple with the commander’s legacy, steeling his resolve to reform the Fire Force’s corruption. He probes links between the Evangelist, stone pillars, and infernal outbreaks, aligning with efforts to thwart the White-Clad’s apocalypse. His arc culminates in a balance of pragmatism and resolve—skeptical yet unyielding in uncovering truths while shielding comrades.