I've started reading the book, and found something interesting. It's well known that Tezuka's own curly hair that tended to stick out in places was the inspiration for Astro's hair spikes. But on page 46, Tezuka is shown sporting a short "buzz cut" for the summer, and takes to wearing a cap to hide his short hair from his friends. (The kids would play a game of slapping a friend on the head when he had a buzz cut). Maybe this was the inspiration for Tamao's hairstyle and cap.
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