Groper Girl

A  is a female character who regularly gropes other girls, obsesses over their underwear, and engages in other open perversions aimed at females she knows. Strangely, her targets rarely have long-term animosity toward her and often remain her friend, and only immediate violent punishment (if that) ever results from her actions.

Compare with Skinship Grope (where the touching is consensual) and Thanks for the Mammary (where it's accidental). May be a Lovable Sex Maniac. Contrast Covert Pervert, who keeps her admiration (and possibly that she likes girls) secret.

Anime and Manga

 * A Certain Scientific Railgun:
 * Kuroko Shirai regularly lusts after protagonist Mikoto Misaka, sometimes using the Power Perversion Potential of her abilities in the process. She is a rare example that does experience long-term animosity for her actions.
 * Ruiko Saten has flipped Kazari Uiharu's skirt to check Uihara's panties on multiple occasions.
 * Tomoko Kuroki, the main character of It's Not My Fault I'm Not Popular!, regularly gropes her only friend and peeks at girls' panties, while her thought balloons insist she is straight.
 * Tina Foster of Ai Yori Aoshi routinely grabs her female roommates' breasts. When she volunteers to coach a high-school swim team, she does a "bust check" on each team member, too – the swim-team member who is also her roommate submits quietly (as shown in the page image), while the other girls object.
 * Ayame Yoshida does this once in K-On! college [sic]. While comparing wardrobes (and measurements), Ayame grabs Mio Akayama unannounced, then comments "She was hiding melons under that grandma shirt!"

Fan Works

 * Homura of Puella Magi Madoka Magica is often portrayed this way in fan art and (to a degree) in spinoffs, but it's not in the original work.
 * In Suzumiya Haruhi no Seitenkan, this is the most prominent character trait of female!Koizumi, who tend to direct her groping tendencies towards Kyonko.
 * In this fan art for the Project A-ko fanfic Project: A-ko The College Years, C-ko's getting a little too familiar with A-ko for A-ko's tastes.
 * A few show up among the Senshi in the Harry Potter/Sailor Moon/Ranma ½ crossover fic The Girl Who Loved:
 * Minako and Makoto routinely grab Harry's butt during group hugs and teleports.
 * Uranus gets her share in, even pinching Nabiki's butt while rescuing her from Yakuza.

Video Games

 * Katsuragi of Senran Kagura loves to grope the Gag Boobs of her fellow shinobi, none of which show long-term annoyance at her actions and even express that they will miss the groping when she graduates. Her sidestory in Estival Versus has her learn to enjoy the rest of a woman's body as well, but the sidestory is ambiguously canon. Her main rival, an Emotionless Girl named Hikage, doesn't care about it; Katsuragi's reaction to that varies between pleased with and disdainful (it's not fun if they don't react)..
 * Ayame, Katsuragi's kohai who idolizes her, is also a groper. Katsuragi hypocritically freaks out when Ayame tries to grope her.
 * Fitting with Kujo Kazuma's tendency to include many off the wall dialog options in games he works on, various dialog options in City Shrouded in Shadow allow the player character to be one. On multiple occasions, "dialog" options are given to pick the character's inner thoughts on her female companion Yuki and these options always include "I'd like to grope her if I get the chance". This is reinforced with options such as swooning over a woman after she bumps into the protagonist butt first, suggesting Yuki and she pass the time while they are trapped by making out (which gets her slapped), to force Yuki to kiss her as a reward for saving her from their mutual peril, and to extort lewd favors from a woman as a reward.
 * Atsumi Munakata of THE iDOLM@STER Cinderella Girls has this as her primary personality trait. Every card but one (where her hands are together) where she's not holding something features at least one hand locked in a grasping gesture. She even holds a pencil with her hand locked in that gesture.

Web Original

 * Kizuna AI loves "touching" features in games, is fascinated by the thighs and breasts of virtual girls, and attempts to manipulate the camera to see the panties of female characters whenever a game allows it. In her crossover with Arihara Tssubasa of Hachigatsu no Cinderella Nine, she repeatedly tricks her into compromising positions and showing her underwear (only to reveal, to AI's disappointment, that she's wearing spats).