Mayuri Shiina

Mayuri Shiina (椎名まゆり, Shiina Mayuri) is Rintarō Okabe's childhood friend and constant companion. She works part-time at a maid cafe called May Queen Nyan-nyan as an employee and occasionally makes cosplay costumes. She is usually the one who financially supports Rintarou's "research" when food is needed.

Appearance
Mayuri is a girl with black hair and gray pupils. Her hair forms fringes that sweep from either side. Mayuri's outfit is simple and comfortable, consisting of a light blue one-piece dress and a hat of the same color. She also wears leggings underneath her clothing.

When she attends to her work in May Queen Nyan-nyan, she wears a blond wig with a long ponytail.

Personality
She possesses a somewhat childish attitude for someone of her age, still interested in childish merchandise and is a bit of an airhead. This might have something with her unability to accept the death of her grandmother when she was young. Mayuri likes to give cute nicknames to familiar people like Rintarou (Okarin) and refers to herself as Mayushii. Despite acting younger than what she looks like, she is also responsible for Rintarou's well-being, usually tending to his needs most of the time. She's also very attentive to detail, often noticing things about people that others would miss. She is the only one to figure out that Suzuha Amane is Itaru Hashida's daughter, showing that she has some ability as a detective.

Mayuri's Ending
Okabe, realizing that Kurisu will die if he saves Mayuri, decides to sacrifice Kurisu's life for Mayuri's sake. Kurisu decides to go along with the plan, despite Mayuri's protest, as she doesn't want Kurisu to die. Okabe has no choice but to send the D-Mail. Everything starts like in Episode 1, and no one has memories of Kurisu, but Okabe. Kurisu dies at the hands of her father and Okabe and Mayuri start a relationship. <<< This is not what happens in the anime.