Early Series (Season 1): Enthusiastic, naive, and compassionate, reflecting a typical, caring teenager. Post-Shibuya (Season 2/3): The voice shifts to convey deep emotional trauma, with a more subdued and intense, "cold" tone. The "Cog" Mentality: A shift towards a detached, duty-driven, and somber tone as he accepts his role to eliminate curses without hesitation. Performance Depth: Voice actors used deep emotional, sometimes method acting, to portray his mental breakdowns, pain, and intense rage.