Nagato's final act of using the Samsara of Heavenly Life Technique to revive those he killed transformed his villainy into a powerful act of redemption, ending his cycle of hatred.
Gintama's immortal villain, Utsuro, finally found the death he craved after centuries of suffering. His students' bonds proved stronger than his hatred, allowing him to rest.
Jin Bubaigawara, or Twice, from My Hero Academia, showed pure friendship in his final moments. Even fatally wounded, he created a clone to save his friends, melting away in Toga's arms.
Obito's death marked the tragic end of a dream turned nightmare in Naruto. After years of seeking an artificial reality, he sacrificed himself to protect those Naruto loved.
Poisoned, Hunter x Hunter's Meruem spent his last moments playing Gungi with Komugi. Their tender handclasp transformed the genocidal king into a frightened, deeply human being.
Demon Slayer's Akaza, pushed to his limit, regained buried memories of his past as Hakuji. He chose death over regeneration, finally apologizing for failing to protect his loved ones.
Bleach's Ulquiorra, after being defeated by Ichigo, disintegrated with a final reach towards Orihime. His last moments revealed a newfound curiosity about the mysterious 'heart' of humans.