Professor Mangetsu (満月牧師 Mangetsu Hakase), also known as Dr. Fullmoon in the US Manga adaptation is a famous wizard and Miyoko's father
Depiction in the Movie
At first, he was introduced as a famous observer that spots something that may be the end of the world. In the magic world, he was a famous magic researches that spots the Demon World that moves nearer in the the earth. Later he was kidnapped by the demons to save her daughter Miyoko but soon saves by Doraemon & the gang.