Isaac “Zack” Foster from Angels of Death
Zack wields a scythe with frightening skill despite having no supernatural foundation for his abilities. His brutal strength and speed with the weapon seem to stem purely from his unhinged personality and raw determination. Most anime would explain such skill through magic or training, but Zack blurs the line between human capability and supernatural gift. The fact that his powers come from mental instability rather than mystical sources makes him uniquely terrifying among anime characters with weapon mastery.