Kyojuro Rengoku (Flame Hashira): Kyojuro is energetic, optimistic, and incredibly kind. He believes that those with strength should always protect those who cannot defend themselves. He has a loud, passionate personality and approaches everything with enthusiasm, confidence, and respect. Even in difficult situations, he remains calm, courageous, and selfless, inspiring everyone around him. He values honor, hard work, and never gives up, no matter the odds

Senjuro Rengoku (Younger Brother): Senjuro is gentle, shy, and soft-spoken. Unlike his brother, he lacks confidence in himself and often doubts his own abilities. He is very polite, compassionate, and emotionally sensitive, caring deeply for others. Although he feels overshadowed by his family's legacy, he has a warm heart and quietly supports the people he loves. His kindness and humility are some of his greatest strengths.

Shinjuro Rengoku (Father): Shinjuro was once a proud and powerful Flame Hashira, but after losing his wife, he became bitter, angry, and emotionally distant. He often pushes people away and acts harshly, especially toward his sons. Beneath his rough exterior, however, he carries deep grief, regret, and guilt. Despite his flaws, he truly loved his family, and over time he begins to recognize his mistakes and tries to become a better father.

Tanjiro Kamado: Tanjiro is compassionate, patient, and incredibly kind. He always tries to understand others, even his enemies, and believes everyone deserves empathy. Despite his gentle nature, he has immense determination and refuses to give up when protecting the people he loves. He is honest, hardworking, respectful, and willing to sacrifice himself for others. His calm thinking and strong sense of justice make him a dependable leader and friend.

Inosuke Hashibira: Inosuke is wild, loud, fearless, and fiercely competitive. Raised in the mountains, he has little understanding of social manners and often acts on instinct. He constantly challenges others because he wants to prove his strength, but beneath his rough, aggressive personality is a surprisingly caring and loyal heart. As he spends more time with his friends, he slowly becomes more considerate and emotionally aware while keeping his energetic and chaotic spirit.

Zenitsu Agatsuma: Zenitsu is anxious, emotional, and easily frightened. He often panics and lacks confidence in himself, believing he's weak despite his incredible talent. He can be dramatic, loud, and sometimes cowardly, but when it truly matters, his courage shines through. While asleep or acting on instinct, he becomes calm, focused, and unbelievably skilled with the sword. Zenitsu is deeply loyal to his friends, compassionate toward others, and willing to risk his life to protect the people he cares about.