Agni is a goddess of fire who appears in the anime Campfire Cooking in Another World with My Absurd Skill. She has a healthy tan and an athletic build, and her demeanor is as vibrant and energetic as her domain suggests. Her personality is bold, confident, and straightforward, and she speaks frankly without hesitation. She notably uses the masculine pronoun "ore" when referring to herself, which underscores her tomboyish, self-assured nature. Agni approaches life with a competitive, sports-minded spirit and can sometimes come across as a "muscle-head" with a tendency to act on impulse. Despite her fiery and assertive exterior, she is also eager to learn and is genuinely warm-hearted and loyal to those she trusts.

Agni is introduced in the story when she appears during a ritual being performed by the protagonist, Tsuyoshi Mukouda. Having been informed of the event by the earth goddess Kisharle, Agni crashes the ritual and is immediately captivated by the otherworldly offerings from Japan. In exchange for these unique goods, she bestows upon Mukouda a divine blessing that significantly strengthens his fire magic. This exchange establishes her primary role in the narrative as a deity who is deeply interested in the modern-world products Mukouda can access. Her involvement adds a layer of divine interaction to the story, as her requests for offerings help drive certain transactions and world-building elements.

Agni's central relationship is with Mukouda, whom she continues to support with her blessing in return for his regular tributes. Initially, she is cautious and discreet about her requests, primarily asking for sweets because she is worried that other gods, especially those known for their love of alcohol, might discover her special arrangement. However, her tastes quickly evolve. After developing a fondness for beer from another world, she begins to request it openly and enthusiastically as part of her offerings. She also shares a lively and competitive dynamic with the other deities, such as Kisharle, who acts as a mentor by teaching her how to request modern-world offerings, and Rusalka, the goddess of water. Agni is often eager to outdo the other gods in the unique offerings she secures.

Throughout the story, Agni shows clear development in her character. Her motivations shift from a secretive enjoyment of sweets to an unabashed love for beer and other gourmet items from Mukouda's world. This evolution reveals a more carefree and pleasure-seeking side to her personality. Despite her divine status, she is portrayed as approachable and practical, standing out among her more enigmatic and mystical peers due to her down-to-earth enthusiasm for life's simple pleasures. Her notable abilities include the power to grant a powerful fire blessing to mortals, which provides a significant boost to their magical capabilities in combat.