is a Japanese character designer,
manga artist, and one of the founding members of the
Gainax anime studio. Before the studio was founded under the official name (it was originally called Daicon Film), he served as animator on the second animated project, the
Daicon IV opening animation. His first assignment as character designer in Gainax was for
Royal Space Force: The Wings of Honnêamise, released in 1987. He also worked as animator on
Gunbuster and , and he came back to this specialty for the first episode of
Diebuster (also known as
Gunbuster 2 or
Top wo Nerae! 2). He is also the character designer of the best known Gainax anime series,
Neon Genesis Evangelion, as well as the author of
its manga adaptation (which is also Sadamoto's first full-length manga work). He is also the character designer for the later
Rebuild of Evangelion films produced by
Studio Khara.