Karim Flam is a 22-year-old lieutenant and priest within Special Fire Force Company 1, standing 178.5 cm tall with a birthday on December 12. His appearance features short, straight dark grey hair brushed forward, shaven sides, small dark eyes often conveying irritation, and a standard outfit of a dark cassock, light high-collared overcoat, dark shoes, and a cross-shaped pendant. He typically wears headphones and wields musical instruments in combat. Personally, Karim projects stern professionalism, caution, and initial distrust toward strangers, sometimes resulting in blunt or insulting remarks. He becomes easily annoyed, particularly by playful behavior during serious situations, yet maintains respect for colleagues and strict adherence to Company 1 protocols. He demonstrates strong leadership, strategic thinking, and a commitment to justice, willingly sharing sensitive information with allies sharing his goals. His loyalty runs deep for childhood friends Rekka Hoshimiya and Foien Li, significantly influencing key decisions. A distinctive speech pattern involves repeating phrases with synonymous wording. As a Second Generation pyrokinetic, Karim utilizes specialized musical instruments to execute "Thermoacoustic Refrigeration." This technique collects external heat energy, converts it into sound within his instrument, and lowers temperatures through repeated cycles to generate ice. The ice immobilizes infernals or opponents and can be launched offensively. A secondary bell weapon produces alarming noises that further reduce heat for absorption. This process, analogous to air conditioning or refrigeration principles, manipulates heat-to-sound conversion rather than direct cryokinesis. His strategic acumen allows rapid planning under pressure. Karim's background involves mentoring recruits at Company 1 while investigating internal corruption. He orchestrates a test for Shinra Kusakabe and Arthur Boyle by placing an infernal-creating insect in his desk, confirming their suspicions while proving his innocence. This leads to the exposure of Rekka Hoshimiya as a traitor creating artificial infernals for the White-Clad. Karim freezes Rekka during a confrontation to prevent escape or further harm, but Rekka is killed by White-Clad snipers shortly after. Witnessing Rekka's death and Foien Li's severe injury (losing an arm to an arrow) drives Karim's resolve to uncover the Evangelist's influence. Following these events, Karim allies with Company 8 to investigate the Evangelist and honor Rekka's memory. He attends high-level meetings with Battalion Commanders regarding spontaneous human combustion and Adolla Burst phenomena, later collaborating directly with Company 8's Captain Akitaru Ōbi. He participates in intelligence-sharing sessions at Company 8's cathedral, revealing Rekka's use of infernal bugs to identify Adolla Burst candidates and supporting specialized training for Company 8 members. This collaboration solidifies his role in opposing the White-Clad's apocalyptic goals.