Yōji Katakara is recognized as the original creator of the anime and manga series Magical Hat. His most significant and documented work is this franchise, which was developed as a media mix project in the late 1980s. The Magical Hat anime television series was produced by the renowned animation studio Studio Pierrot and aired on Fuji Television and its affiliates for 33 episodes from October 18, 1989, to July 6, 1990. The series is an adventure fantasy that follows a young boy named Hat, a descendant of a legendary hero, who gains magical powers from a turban to battle demons in an underworld realm.

Alongside the anime, Katakura personally wrote and illustrated a manga adaptation of Magical Hat. This manga was serialized in several of Shogakukan's magazines for young readers in 1989, including publications such as Shogaku Ichinensei and Shogaku Ninensei. The manga chapters were later compiled and released as two tankōbon volumes, with the first volume published in October 1989 and the second in May 1990. Katakura made a brief appearance in the anime itself, voicing a cameo role as himself in the twenty-fourth episode of the series.

Katakura was also involved in the Doraemon franchise, contributing to an educational book titled Olahraga Palang Tunggal dan Peti Lompat, which is part of the Doraemon Science Series, published in 1995. His career was cut short by his death in 1997, which resulted in the Magical Hat manga remaining unfinished. Despite the incomplete nature of the source material, his work on Magical Hat represents a complete media franchise that included not only the anime and manga but also a related video game for the Sega Mega Drive, demonstrating his role in a significant cross-media project of the era.