Mystery Girl

"S." or the Mystery Girl, is a character that first appeared in "Last One Out of Beach City".

Appearance
The Mystery Girl bears a close resemblance to Rose Quartz, as pointed out by Steven. She has voluminous medium length hair that is dyed pink. She has defined lips with a grey ring pierced on her lower lip, and a slightly dark-peach complexion. She has a heavy build and is taller than Pearl, roughly around Garnet's height. She has green eyes and wears dark grey eye shadow and has thick eyelashes, and, aside from the aforementioned lower lip piercing, she has three grey earrings on each of her ears, with highest and middle piercing smaller than the lowest one.

In "Last One Out of Beach City", she wears a white (with a slight hue of pink) crop top with what looks like a simplified animal design, and with the sleeves rolled up. She also wears dark grey pants with the right leg having a rip near the knee, and black combat boots. She has a jacket tied around her waist; the jacket having various rectangular designs in varying shades of green similar to a camouflage design.

"Last One Out of Beach City"
Pearl, Amethyst, and Steven stop by the Big Donut to pick up some snacks. The Mystery Girl walks into the Big Donut and immediately catches Pearl's eye. Steven and Amethyst urge Pearl to speak to her. Pearl approaches her, but accidentally fumbles and knocks over a stack of cups before she could say anything and Mystery Girl leaves the Big Donut.

Eventually, she pulls up beside Pearl, Amethyst, and Steven on a motorcycle on the road. Following Amethyst's advice, Pearl gives the girl a look. She smiles back at her, causing Pearl to blush. The girl then drives through a yellow traffic light, while Pearl gets stuck at the red light. After a moment, Pearl drives through the red light after the girl. After the car chase with the Police Car, the three hear music, and upon following it to its source, find themselves at the concert they had meant to go to. They spot her there as well. Pearl decides to go talk to the girl. Amethyst begins to worry about her, afraid that Pearl will be rejected. But Pearl's conversation with her goes well, despite being a bit awkward. Afterwards, Pearl is confused, saying that the girl walked off after giving her a code on a piece of paper. Steven and Amethyst are quick to realize that Mystery Girl gave Pearl her phone number.

Pearl
Although not noticing Pearl at first at the Big Donut, the Mystery Girl catches up to Pearl, while the two are driving, and flashes her a smile. At Mike Krol's concert in Ocean Town, she checks Pearl out before she shakes her hand. The two of them discuss about how she dyed her hair and, briefly, the Rebellion. But before leaving, she gave Pearl her phone number, showing her attraction to the Gem.

Trivia

 * According to Lauren Zuke, Mystery Girl's piercings were inspired by her World of Warcraft character.
 * Lauren Zuke says she "was calling her “Sheena” in [her] head" as a reference to the song Sheena Is a Punk Rocker by The Ramones. Her actual name is unconfirmed.
 * According to the same blog, Mystery Girl is a smoker.
 * S's phone number is 301-555-0189. The area code (301) corresponds to western Maryland, while numbers of the form 555-01XX are reserved for fictional use.
 * Along with Onion, S. is one of the few characters with an important role that hasn't said a word.