Natsumi is the powerful older sister of Fuyuki and the one in charge of the Hinata house when their mother is not home. A minor celebrity of sorts in her own school, she often gets pleas of help from classmates like Yayoi and Satsuki (below), due to her unparalleled physical skills. Feisty and genial, Natsumi is equally capable as a friend, a fighter, and a loving family member. She is very strict on Keroro and always doubts of his intentions, physically abusing him on several occasions (as well as treating him as a house slave), and never calls him by name, only snapping "Boke gaeru" ("stupid frog") at him whenever she has to. Inversely, her infatuation with Saburo proves to be her only weakness on several occasions. Unlike her brother, Natsumi is highly sensitive spiritually, feeling an "oppression" when ghosts are near.
In M.U.G.E.N has been made by Sankiti.
Natsumi is a fairly fast 6-Button character (with one button lacking a neutral attack) with a varied moveset which includes various punches and kicks, throwing Keroro at three angles, and numerous assists from other characters. She is a bit overpowered despite her low damage because of how easy it is to chain her attacks into long combos. The rate which she gains power and the amount of power used in her supers is also unbalanced, as is the damage dealt, making her able to wipe out most opponents fairly quickly.
Her AI is very brutal, and utilizes the extremely easy combos and other unbalanced features to prevent opponents from retaliating altogether before finishing them off with her Hypers.