This universal trend was started by Osamu Tezuka, creator of the legendary Astroboy. Specifically, it sprang from Tezuka’s love of Walt Disney animation. Bambi was one of his favorites. He confessed having watched it over 80 times. Tezuka was obsessed by 1930s and 40s Disney film style, and he borrowed its huge, expressive eyes technique. Because his work is a foundations of contemporary Manga, this trait became a defining feature of its character designs.