O-Natsu is a character in the Keroro Gunso series.
She is one of the characters in the Warrior Kero series who lives on planet Sengoku. She looks just like Natsumi but with a nicer personality. In the second chapter, Giroro helped her at the comedy contest and she became an idol. On the last episode, she is revealed to be one of the guardians who saved planet Sengoku when her weapon came back to her and she remembered