Mayuri Shiina

Mayuri Shiina (椎名まゆり, Shiina Mayuri), also called Mayushii, is Rintarō Okabe's childhood friend and companion. She works part-time at a maid cafe called May Queen Nyan-nyan as a costume maid and occasionally makes cosplay outfits. 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 eyebrows are noticeably thick.

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 blonde wig tied into a long ponytail.

Personality
She possesses a somewhat childish attitude for her age. She is still interested in childish merchandise and is a bit of an airhead. This may have something to do with her inability 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.

Mayuri was also shown to be quite simple-minded, as she mostly seems to only care about food or toys. She cannot handle complicated information thrown at her by Rintarou or Kurisu, often misphrasing or misunderstanding them, though at certain times her responses can be quite helpful. Also, Mayuri does not question Daru's perverted comments and mannerisms, or are not in any way offended by them (though this is likely because she does not interpret them as such).

Despite acting younger than she looks, she is also responsible for Rintarou's well-being, usually tending to his needs most of the time. She's also very attentive to details, 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 need to "die" (false blood and taser, thus altering the timeline but making it so their paths do not cross) if he saves Mayuri, decides to sacrifice being with Kurisu for Mayuri's life. Kurisu decides to go along with the plan, despite Mayuri's protest, as she doesn't want Kurisu to disappear. Okabe has no choice but to send the D-Mail. Everything started again like in Episode 1, and no one has memories of Kurisu, but Okabe. After hacking into SERN's database with the IBN 5100, 1% divergence is achieved. Okabe vows to remember his memories of Kurisu, and spends his time with Mayuri as lovers.

Trivia

 * Mayuri's voice was used as a user guide for the Phone Microwave. According to Rintarou, it made the Microwave sound silly.
 * She was the first person to discover the Microwave's "irregular" abilities when she accidentally froze her karaage while trying to thaw it. She also gave the gel-i-fied bananas the name "gelbana".


 * Mayuri, like all other characters, has blurry memories of what happened to her in the other world lines, though unlike them she only thinks of the memories as "bad dreams".
 * In one of the (failed) attempts to save Mayuri, Rintarou sent her to the past. However, instead of arriving normally, she dies and her body was gel-ified. This scene is only briefly shown in the anime.
 * The gel-ified Mayuri still resembles her normal form a great deal, as the details on her outfit along with the color of her hair are still visible and her body is not distorted in anyway, unlike SERN's experiments.