|Relatives|| Shu Ouma (Son) |
Mana Ouma (Daughter)
Saeko Shijou (First Wife; deceased)
Haruka Ouma (Second Wife)
|Anime debut||Episode 20|
He has brown eyes and hair similar to Shu. His beard is often left unshaved and messy due to his lack of concern to himself because most of times he's busy researching. He is quite tall and mostly seen with white-laboratorium jacket and glasses.
He was smart, clever, goofy, and a hard-worker proven by him spending most of his time in his research. Because he always believed himself to be self-sufficient, he was not good at interacting with others. Thus, he named his son Shu (which means "group" according to him), perhaps in hopes that Shu would grow up to be different.