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Rio has long, straight strawberry blond hair (blond in the anime and dark blond in the OVA) and grey eyes (blue in the anime).
Rio is a friendly, energetic girl and somewhat of a trickster. She's playful, has a bit of a dirty mind, and has been noted to be rather intelligent. She claims she was originally a serious person, something that would prove to be true when she disagreed with Nagisa's proposition to save Korosensei and continue to kill him.