In 1994, he was put in charge of character designs for the first time with Marmalade Boy.
Since then, he has done character designs for many series, such as HeartCatch PreCure!, Ojamajo Doremi, and My Hero Academia.
[3] Starting in 2016, Umakoshi created the character designs for the anime adaptation of My Hero Academia.
[4] He also provided the character designs for the three anime films based on the series.
[5][6][7] The series has received praise, with Paste ranking the adaptation among the top 40 anime of all time.