|First appearance|| |
|Voiced by|| Kenichi Ogata (Japanese)|
Greg Dulcie (Funimation)
Fung Kam Tong (Hong Kong)
|Species / Type||Keronian|
|Occupation||Keron Army soldier|
He is a famed war veteran, and has obviously inspired Keroro to become a soldier. However, though Keroro greatly respects his father, it is clear that Keroro is also quite afraid of him. Keroro's father is frequently on vacation. He usually brings Giroro's father on vacation with him. During Chrismas Eve, they assisted Santa Claus in delivering gifts and rewarded with a trip to hot springs during spring season.
The Demon Sergeant's appearance is similar to Keroro's, except he is olive green in color, and wears a pickelhaube helmet - a black helmet that has a spike protruding from the top. He also has a toothbrush mustache and a blue tie. He carries something similar to a US military Duffel bag (his is a large circular bag that is light purple and has small yellow stars).
According to episode 143, like Keroro's gerogero (ゲロゲロ) sound, Keroro's father has a characteristic yokayoka (ヨカヨカ), which brings fear to Vipers everywhere.