Why do Kenshin's eyes change color? When Kenshin is content and in his normal, day-to-day state, his eyes are purple.



Yet, when he is incensed or when he must resume his Hitokiri Battousai persona, his eyes turn yellow:



Why do Kenshin's eyes change color?
In this Wiki, it is stated that:


  Kenshin's eyes, too, are unusual, being a deep violet. In the anime series, when Kenshin's eyes change to reflect his psychological reversion to Hitokiri Battōsai, their color shifts from violet to gold.