Keroro's Father (ケロロの父 Keroro no chichi), also known as The Demon Sergeant (鬼軍曹 Oni gunsō), is a character in Keroro Gunso. He is the husband to Keroro's Mother and the father of Keroro.
Character[]
He is a famed war veteran, and has obviously inspired Keroro to become a soldier. In Kero 0: Depart! Assembly of Everyone!!, it's shown that he generally trusts Keroro.
In the manga, his wife notes that he resembles his son Keroro quite a bit, which makes her worries about Keroro, since they can be quite airheads. However, by the end, it turns out at the end of the day they get the job done. Keroro greatly respects his father, having an idealized image of him as a perfect soldier, and so is also really afraid of him.
In the anime, when he appears in the present, Keroro's Father is generally portrayed as constantly tired and sleepy, sometimes even drunk. In his later travels to Earth, he noticed Keroro's lies about progressing the invasion, but keeps full trust on him. He usually brings Giroro's father on vacation with him. During Christmas Eve, they assisted Santa Claus in delivering gifts and rewarded with a trip to hot springs during spring season.
According to the Chō Keroro Gunsō UC: Keroro Robo Daikessen manga, Joriri is actually his relative and he respects him a lot as the hero of the Gekonam War. However, when his wife starts reminiscing about those old days, talking about how all girls loved the young Joriri, he gets jealous and ends the conversation about him.
Appearance[]
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).
In the anime, he's usually shown with half closed eyes, like he's tired or sleepy. In the manga, he's seen like that in his first appearance due to being unused to Earth's atmosphere, but afterwards keeps open round eyes similar to Keroro's. However, during KeroZero and early appearances, he had open eyes like Keroro's even in the anime. An even younger version of Keroro's Father, from the time of Chibi Kero, is shown to have a green tie with a yellow star on it.
Speech mannerisms[]
Keroro's father uses the Kyushu Dialect. According to episode 143 of the anime, 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.