When designing a 9-year-old's room, it's time to move away from cartoon themes and embrace a more mature, personal touch. Consider filling the walls with art, posters, or motivational quotes to inspire creativity and individuality. Add splashes of color through bedding, curtains, and accent pieces to create a vibrant and energetic atmosphere. Ensure there is plenty of storage space to keep the room organized and tidy, encouraging responsibility and cleanliness. Introduce some tech elements, like a smart speaker or functional desk lamp, to cater to their evolving interests and technological skills. Lastly, make the room adaptable by incorporating furniture that can be easily rearranged or repurposed as they grow and their preferences change.