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 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 with childish merchandise and is a bit of an airhead. Mayuri likes to give cute nicknames to familiar people like Rintarou (Okarin). Despite being 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.