Pekoponians

Hinata Fuyuki: He is very interested in the occult, and his knowledge benefits the Keroro Platoon a lot. He loves adventures but is very bad in sports. He shares a close bond with Keroro, and is the current holder of the Kero-Ball.

Hinata Natsumi: A very atheletic girl, she is the one who usually foils Keroro's plans. Keroro usually describes her as 'Pekopon's Main Defence'. She addresses Keroro as 'Stupid Frog'.

Hinata Aki: The mother of the family. She is constantly interested in the Platoon as a manga artist. She feels that the Platoon is also part of the family, and occassionally helps the Platoon in animation plans.

Angol Mois: A niece figure of Keroro, she has a crush on Keroro, but unlike Tamama, her's is more pure. She is hated by Tamama and feared by Kururu, and constantly helps the Platoon. She is part of a race of destroyers, called the Angols. Unlike her kind, she is sweet, clumsy and peppy. She wields a spear, the Lucifier Spear, which has one end a cresent, and another end a meteorite.

Nishizawa Momoka: The only daughter of a billioniare, Momoka has a huge crush on Fuyuki and will do all means to get his affection. Like Tamama, she also has a split persona, but she can communicate with the other persona though.

Saburo/Mutsumi: Natsumi's crush, Saburo is rumored to be part of a gang, but it turns out that he is a loyal but solitary guy. He is also the DJ of a radio show, which Natsumi loves listening to, but has no idea it is Saburo. He uses the name Mutsumi as a DJ, and Saburo in real life. He is Kururu's partner and is very smart.

Azumaya Koyuki: Koyuki is a former ninja and a good friend of Natsumi. She believes in friends and is the only one who understands Dororo. She found Dororo in a forest and thought him to be a ninja. She is carefree and optimistic, and believes in what is right.