From Keroro Wiki:

Mine Yoshizaki (吉崎 観音 Yoshizaki Mine), born December 2, 1971 in Isahaya, Nagasaki) is a male Japanese manga artist (mangaka) who first started his career by making dōjinshi based on video games. Yoshizaki also worked as an assistant to mangaka Katsu Aki . His first publication was featured in a compilation book published by Shogakukan in 1989.
He is best known for his manga Keroro Gunso, published as Sgt. Frog in the United States, which was first published in the Japanese manga magazine Shonen Ace. He is also the creator of Arcade Gamer Fubuki and did character design on the series Seven of Seven. In 2005, Keroro Gunso received the 50th Shogakukan Manga Award for children's manga.