Summary
- Nichirin swords in Demon Slayer come in different colors that represent the wielder's Breathing Style, with black blades being associated with the Sun Breathing technique.
- Some characters have specialized styles that have unique colors, such as Shinobu's light purple sword, representantive of her Insect Breathing, which is a subset of Water Breathing.
- Nichirin swords can have patterns or markings that contribute to their color-changing ability, and some characters wield weapons other than katanas, like Mitsuri's pink whip-like blade or Genya's shotgun that fires Nichirin shells.