Natsumi as seen in Episode 6
|First Appearance||Episode 1|
Natsumi lives with her mother Aki Hinata and her brother Fuyuki. She gets caught and tied up twice when Keroro breaks into their home, leading her to develop an adverse relationship with him and his crew. While she can usually get along with the platoon, their antics easily get on her nerves. She's usually the first to question something or to get angry over it; her temper can be very short, and she can be fairly sarcastic.
There have been several hints throughout the series that Natsumi has a hidden interest/fetish for bondage and/or rape.
Natsumi is capable of being around the platoon without any problems, but they can anger her very easily; they once did so three times in two days. Episode 10 suggests that she is aware of Giroro's crush on her, and while she does not reciprocate his feelings, she is at least glad he has not harmed any of her other potential love interests.
She is the subject of a school-wide obsession: literally every girl at her school, most notably The Lesbos, is in love with her on a worrisome level. She is less-than happy about this and does not consider any of her admirers to be genuine friends. She considers Koyuki to be the only real friend she has, and she would rather that Koyuki didn't try to push their relationship further than that.
She has a crush on Saburo and likes to listen to his radio show to have her existence validated by a man instead of a woman. Despite this, she was guilty of not even noticing him in the very first episode.
Natsumi: "You're fucking serious. That thing broke into our home, captured me, and tied me up. And you want to be its friend."
Fuyuki: "Don't you too, Natsumi?"
Natsumi: "...Kinda..." - Episode 1
Koyuki: "Is that the bracelet of rejection...?"
Natsumi: "Of course not. It's the Permanent Friendship-Zone Bracelet! *Suddenly serious* Let's stay friends. Just friends. You're the only real friend I have." - Episode 10