Youjirou Oga

is the father of Tatsumi Oga and Misaki Oga. Unlike his children, Oga's father is a very moral and humble person. Upon being introduced to Hilda and Beelzebub IV, he immediately forces his son to take responsibility for them. In the anime, he even has a sliding grovel which he is quite proud of.

Trivia
In an episode preview, he reveals that he is upset that he doesn't have a name yet, complaining that even Furuichi's sister has one, but not him.