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Iris Watson is a child prodigy who lives with the renowned detective Sherlock Holmes. Despite being only ten years old, she holds a medical PhD and is the author of The Adventures of Sherlock Holmes series of novels.
Iris Watson was described to Kazuya Nuri as a "genius girl". Nuri worked gothic and mad scientist elements into her design to illustrate this. She and Sherlock Holmes were designed to look good on the screen together.