| Professor Otowa|
音羽博士, Otowa Hakase
|Date of Birth||unknown|
|First Appearance||Taiko no Tatsujin: Doka! to Oomori Nanadaime|
|Japanese VA||Takashi Nagasako|
He is voiced by Takashi Nagasako in the series.
Otawa has white hair, with the top of his head being bald. He also has the round nose with white mustache below it.
He is normally seen wearing the science researcher outfit.
While Otowa is mostly a nice person, he can be somewhat stubborn on something. He also has no true objective on whatever he is working on.
As seen in the Junji Ohno's manga, Otowa can be very selfish. This, combine with the fact that he has no objective on his works, makes him felt troubled as he modifiy Mecha-Don over and over again without any objectives.
In the series
Otowa, in the past, had researches together with Doctor Waruru. However the two soon seperated as Waruru stole Otowa's research data (Due to Waruru's laziness.) and went missing.
Otowa, as seen in Doka! to Oomori Nanadaime, wanted to send Mecha-Don to the end to space, but it seems that he has no true objective at all.
In Do-Don to Nidaime!, Otowa was surprised to find out that his former co-worker Waruru is doing evil things around the on-going festival.
In Junji Ohno's Taiko no Tatsujin manga, he was troubled about modifiying Mecha-Don without any objectives.