Rengoku Kyojuro is a pillar of the Demon Slayer Corps and serves as the fatherly figure to the breath users. Rengoku possesses a compassionate soul with an admirable fighting spirit, evidenced by his Hot-Blooded persona. He excels in the Flame Breathing style, emphasizing a swift and passionate approach to combat. Known for his distinctively red headband and elaborate sword, his attire symbolizes his deep connection to the Flame Hashira lineage. Rengoku is well-regarded and respected among the demon slayers and the public for his unwavering courage and kindness. Despite his challenging schedule, he maintains a friendly and gentle demeanor towards those around him, including his family and allies. He has a strong sense of justice, valuing the lives of others and is committed to protecting them from the demons, much like his fellow hashira. His unbreakable will power and determination make him a formidable opponent to the demons, especially the Upper Moons, whom he has faced and vanquished during his duty.