Natsuki (ナツキ) is a main character of Doki Doki Literature Club!. She is the fourth member of the Literature Club, and a character whom the player can write poems for.

Natsuki is a notably short-statured, 18-year-old[1] young woman, frequently referred throughout gameplay by other characters as having an outwardly "cute" appearance; having perpetually flushed cheeks and a fair-toned skin color. Her canine teeth are longer than the rest of her teeth, making them visible when she opens her mouth wide enough. She is the shortest member of the Literature Club, a particular feature that results in people commonly mistaking her for a first year student. In Act 2, Monika suggests that Natsuki's height is due to a case of malnutrition—because of the apparent abuse from her father, Natsuki's growth has become significantly stunted as a result. Following this, Natsuki is portrayed to have a bit of an underdeveloped physique for her age; having a thin, broad-shouldered build and a flat chest.

Natsuki has fringed, bobbed Pastel-Pink hair lengthening to her chin. Her bangs are predominantly swept to the right, having two prominent strands of hair framing either side of her cheeks. Her hair accessories consist of a red anime~esque X hairclip, paired along by two red ribbons holding up two small matching pigtails on either side of her head, with the rest of her hair left down. Her eyes are glittery and colored the same as her hair, and her face is often worn in a sour or pout-y expression.

While in school, Natsuki wears the standard-issue female school uniform: consisting of a warm gray blazer fully buttoned and untucked, a trimmed mocha-brown sweater vest, a collared white shirt slightly unbuttoned at the collar with a thin red ribbon attached at the collar, a dark blue pleated skirt, thin white calf-high socks and white uwabaki slippers with sky-blue fronts.

If the player decides to help out with Natsuki over the weekend in Act 1 to bake cupcakes for the upcoming Festival, Natsuki wears a puff-sleeved white shirt with a small light pink cat face emblem on the left side, paired with light pink trims lining the edges of the sleeves. Tucked under by a tri-tiered frilled light pink tutu with a thin black trim at the top hemline. Under the shirt, two black bra straps are visible on her shoulders. Footwear is not shown.