"That idiot won't be in trainee forever unless he get rid of his act!"
- ―Captain Ohkohchi
- ―Katsuto training himself, Ultraman Zearth 2: Superhuman Big Battle - Light and Shadow
|Transformation Item||Pikari Brush/ Pikari Brush 2|
|Home world:||Land of Sparkles|
|First Appearance:||Ultraman Zearth|
|Last Appearances||Ultraman Zearth 2: Superman Big Battle - Light and Shadow|
|Affiliation||MYDO (Mysterious Yonder Defense Organization)|
|Portrayed by||Masaharu Sekiguchi|
Asahi is typically dressed in his uniform of a white red striped shirt, grey hat and pants, his MYDO uniform is a red flight suit and helmet.
Coming to Earth to clean the polluted planet Katsuto brought with him an incredible hygiene obsession and a fear of dirt. Joining the MYDO, disguised as a gasoline stand, Katsuto was relegated to the position of janitor because his fear of dirt interfered with his training stopping him from becoming a full fledged member. However when the team went out Katsuto would use the time alone to transform into his true identity Ultraman Zearth.
Ultraman Zearth 2
- Katsuto is a human form created by Zearth like Dan Moroboshi.
- Katsuto is the first Ultra Hero that needed to brush his teeth to transform, others simply performed an action like waving their hands.
- Katsuto is seen by some as the most incompetent of all Ultra hosts. In the first movie he had paralyzing fears of pollution dirt and anything messy in general, and despite joining MYDO he never graduates from training and was relegated to the role of a janitor while other Ultra hosts have become analyzers and mainly pilots. However by the end of the movies he always works to overcome his fears.