Demon Slayer: Kimetsu no Yaiba Infinity Castle - Characters & Cast

To defeat Muzan and turn his sister back to human, while protecting his mentors and friends from suffering the same fate as Rengoku.

Tanjiro transitions from a student to a master-level swordsman. He unlocks the 'Transparent World,' a state of heightened perception, allowing him to bypass Akaza's defenses. Crucially, he maintains his empathy, acknowledging Akaza's tragedy even while delivering the killing blow.

Originally to become the strongest; later revealed to be a twisted desire to cure his loved ones, which morphed into a hatred of the weak.

Starts as a battle-hungry demon obsessed with strength. Through his fight with Tanjiro, he is forced to confront his suppressed human memories of his sick father and murdered fiancée. His arc ends in a heartbreaking suicide where he destroys his own regenerating body to atone for his sins.

To kill the demon Doma who murdered her older sister, Kanae, regardless of the personal cost.

Shinobu enacts her final plan against Doma. Knowing she cannot win by strength, she sacrifices her life to be absorbed, setting a trap that will aid her allies later. She accepts her death with a mix of rage and grace.

To avenge his Gramps (Jigoro Kuwajima) who committed seppuku due to Kaigaku's betrayal.

Zenitsu sheds his comic relief persona entirely for this battle. He fights awake and focused, driven by rage and duty to punish Kaigaku for disgracing their master. He invents a new form of Thunder Breathing, proving his own worth.