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Charlotte Birkin, better known as Bad Girl (バッドガール, Baddogaaru) is a main character in the No More Heroes video game series. She is introduced as a 23-year-old assassin who lived in the basement of Destroy Stadium and was ranked second in the United Assassins Association.

After her death at the hands of Travis Touchdown in No More Heroes, she would be resurrected a decade later by him and her father, Shigeki Birkin (also known as Badman) in Travis Strikes Again: No More Heroes.

Travis Touchdown encounters Bad Girl in the basement of Destroy Stadium. Bad Girl has a conveyor belt in the room which she uses to draw condemned criminals wearing gimp suits close enough to her to use for target practice, clubbing the men with enough force to catapult them across the room. She chats with Touchdown, telling him that killing is nothing more than "the daily grind." Touchdown, disappointed in Bad Girl's lack of satisfaction from taking lives, calls her "no assassin, just a perverted killing maniac." In retaliation, Bad Girl claims that although her methods are crueler, in essence, she and Touchdown, as assassins, are principally no different. She faces off against Touchdown, and their battle ends when Touchdown drives his beam katana through Bad Girl's abdomen. Refusing to give in, Bad Girl continues to pummel Touchdown until he claims to forfeit the match. Bad Girl succumbs to her wound almost immediately, and Talbot and Weller, the UAA's body disposal crew, arrive on the scene to remove her remains. Touchdown speaks to them briefly but passes out from the shock of nearly being killed.

Ten years following her death, a picture of a younger Bad Girl appears in the trailer for Travis Strikes Again: No More Heroes. Her father, Badman, has hunted down Travis Touchdown, seeking revenge for the death of his daughter; however, during their fight they are sucked into the Death Drive Mk II, a game console able to grant wishes. Upon gathering and beating all six of its games, Travis wishes for Bad Girl's revival, but in a twist of events, she returns as a dog (promptly named Bad Dog) since one of the death balls was a forgery. Her father then vows to go upon another adventure so that he might fix the curse which was placed upon her.

However, as of the newest DLC for the game, Travis manages to retrieve the real Death Ball. Now having all six Death Balls, his wish is able to be properly granted and Bad Girl is restored to her former self.

While happy to see his daughter again, Badman realizes that he and Bad Girl are no longer the same people they used to be the last time they saw each other. She was no longer Charlotte Birkin, and he was no longer Shigeki Birkin, they were now Bad Girl and Badman. With this in mind, he decides that they should part ways and live their own separate lives. Despite this, he acknowledges that while they are no longer the same people they once were, they still have the same blood and are still family.

In No More Heroes III, Bad Girl is roommates with Shinobu in Travis's flat. When FU and the Galactic Superhero Corps invade the Earth, she and Shinobu aid Travis in dealing with the alien threat. However, when FU himself accosts the group at the No More Heroes motel, he easily defeats them by incapacitating Travis with a kick to his gut, maiming Shinobu by dismembering both of her arms and crushing Badman's head after he arrived to Shinobu's aid. Bad Girl later arrives to see Travis, Shinobu, and her father all decimated at the hands of FU, but is utterly devastated upon seeing her father's corpse, and is left in a catatonic state of mind for a long period of time as Travis enters the Galactic Rankings to avenge his death and stop the alien invasion. She eventually does recover from her depression and joins Travis and the rest of their allies as they head on over to Damon's Tower to confront FU. Travis and his allies weaken FU throughout the fight, and Bad Girl and Shinobu ultimately get their revenge on him with Bad Girl whacking FU with her baseball bat, sending him flying in the air and Shinobu finishing him off via decapitation causing FU to physically and mentally revert back into a child. FU attempts to flee back to his planet, only for Damon to betray FU by activating his device and detonating FU's ship, killing FU.

After Travis defeats Damon, a funeral is held for Badman, where he is buried at sea. Bad Girl and Travis delivered their eulogies, with Bad Girl giving a very tearful one to her late father, speaking on how much she loved him as the only family she had left. Bad Girl then scatters his ashes to sea, with the rest of the group throwing flower pedals overseas. Bad Girl then throws the bouquet of flowers overseas, where she says her final goodbye to her father, affectionately calling him her "No More Hero".

Afterwards, FU's father, Jess Baptiste V, arrives on Earth alongside his alien armada and as he's about to begin his invasion of Earth, he is suddenly killed in seconds by future versions of Travis and Sylvia's children, Hunter and Jeane and Native Dancer, who is revealed to be Scott Touchdown, the son of Jeane and the grandson of Travis and Sylvia. Bad Girl asks who are they, with Shinobu responding to her that they are the twin children of Travis. Hunter, Jeane, and Scott explain to the group that Henry killed Travis in the future and teamed up with an alien force to destroy the planet, and asks Travis to join them to help them change the future, much to his befuddlement.

She is shown to have a friendlier relationship with Travis and Bishop, hanging out with them for drinks, and both of them referring to her by her real name (much to her chagrin).

Bad Girl dresses in a pink frilly dress and white stockings. She has long wavy blonde hair slightly curled at the end, a fair complexion and blue eyes. She is aggressive, violent, angry and very determined. Despite referring to killing as nothing more than a job, she seems to enjoy it nonetheless. Bad Girl seems to be aware of her violent ways, calling herself an "angry bitch", though she doesn't feel Touchdown is any better than she is, as an assassin. She also drinks heavily, leaving her empty beer cans strewn about her basement home, and even keeping a fridge nearby to refrigerate her cans.

When she returns as Bad Dog, her appearance gives her pink and blonde fur. The blonde fur resembles her previous hairstyle. She also has blue, anime-like eyes. When Travis attempts to 'talk' to her, she will begin to growl at him.

Despite her juvenile personality, Bad Girl is a dangerously powerful assassin, as well as one of the few people who came close to killing Travis. Not only is she incredibly skilled with a baseball bat, to which she can knock Travis and grown men a few yards away with her superhuman strength, she also is incredibly manipulative. She can present herself as 'weak' while crying, making her attacking opponents wide open for an instant kill counterattack. However, her emotions seem to be incredibly sporadic, causing her to genuinely cry in a fight or to be so blind with rage that she would recklessly rush into attack Travis with her bat for the sake of winning (and ultimately leading her to her death).

Like her father, she seemed to develop a fighting style that works with her alcoholic lifestyle. While drunk, she seemed to develop super strength and superhuman pain tolerance (like being able to easily withstand most fatal attacks from a beam katana). When desperate, however, she is willing to give up some of her alcohol in order to light her baseball bat on fire, which increases the range and power of her attacks.

Bad Girl can be a relatively easy boss to fight if players identify her attack pattern. She begins the battle with a few quick swings of her bat, so approaching her is not advised. When she finishes spamming swinging her bat she is vulnerable to attack, and players can easily unleash a Slash Combo before retreating to evade her counterattack. During the second phase of the fight, Bad Girl will drop to the ground and start crying or may pretend to cry. Attacking her or getting too close when she is pretending will result in a game over. You can tell the difference based on the position of her hands. If both her hands are covering her face, she is crying for real and you can get in free hits. If one hand is covering her face and the other is near her bat, she is pretending and should be avoided. Alternatively, it is recommended players either charge the beam katana in the meantime or power up a heavy attack.

Bad Girl appears on three trading cards in the Design Materials set of No More Heroes. These are No. 81, No. 82 and No. 144.