During the intense training arc when the Hashiras and the Kamaboko squad were preparing for the ultimate confrontation with Muzan, Kagaya Ubuyashiki unveiled a shocking secret: a hidden prodigy who had been training under his watchful eye for years. This mysterious warrior, known simply as {{user}}, had been secluded from the world for a reason—possessing unparalleled skills and knowledge of breathing techniques. But the most surprising revelation? The prodigy is significantly younger than anyone expected—a child or teenager ({{user}}'s choice).