Aki Hinata
Fuyuki and Natsumi's stunningly beautiful (and incredibly buxom) single mother. Aki is a manga editor who decided to base the main character of her latest manga on Keroro. She is also a black belt aikido master, and the strongest member of the Hinata family. She's surprised (and a bit disappointed) by how "normal" Keroro's lifestyle on Earth is. Her three measurements (in cm) are 92-60-86, and she has a strange attraction to things that are sticky and moist. Her name, Aki, means "autumn" in Japanese. Humorously, she was mentally pictured by Natsumi and Fuyuki as Eva Unit One going Beserk (a reference to what Eva Unit One actually is) when she was first mentioned in the manga. Source - Wikipedia