The series' main character, the middle child of police detective parents. She refuses to become a police officer and instead spends her days in Shibuya having fun with her best friends Miyu and Aya. Despite this, Ran has a strong sense of justice and will help her friends and others alike if they're in trouble.
Badass Normal: Can take down a robber just by throwing one of her own boots at the guy.
Berserk Button: it's really not a good idea to bully girls as long as Ran is around in Shibuya.
Book Dumb: As Lampshaded every single time, Ran is very intelligent, but studies so little her grades are inevitably low.
Also Subverted once a year, right before she retake her exams to advance to the next grade (and even to graduate): either by being tricked into it, by betting she'll pass the exam without cheating or to make a recital before the whole school, she gets motivated to study and manages to get the top grades. She calls this "Miracle Switch".
Chaste Hero: Despite the Gals' fame as promiscuous, she's still a virgin and proud of it, and in fact advises people to not even give a single kiss until they're sure of their partner's feelings (one of the people she advised this way was Miyu, whose problem with her boyfriend was that he was waiting for her to get older for that kiss).
You Are What You Hate: for someone who doesn't want to be a police officer, Ran has shown plenty of times of how she has the skills to be one: the strong sense of justice, detective skills, willingness to help out others, etc.
It's later revealed why Ran refuses to become a police officer. She would have to give up her typical fashion tastes and wear a standard uniform, which she's disgusted to do. Her father's pressure only makes things worse, as Ran doesn't want to follow a path decided by someone else.
And, in the end, Ran decides to become one to better protect her beloved Shibuya.
Foreshadowing: In an early chapter, Ran insisted to deal with Miyu's Stalker with a Crush because, in Ran's own words, if Miyu snapped they risked a massacre. Flash forward, when Miyu finally snapped she was ready for murder.
A student at Meisho Number 1 High School, Rei is also considered the number 1 popular guy due to a magazine article as being the coolest teenage guy in the area. Is good friends with Yuya and often finds himself bumping into Ran more often than either one would like. He's also Aya's boyfriend.
Beta Couple: with Aya early on. They become out-and-out official at the end of the series.
Also a student at Meisho Number 1 High School, Yuya placed 2nd in the same magazine article that said Rei was the coolest and most handsome teenage guy in Shibuya. As such, his nickname is Number Two ("nii" in the Japanese version, the Japanese word for two). He is in love with Ran and will help her out when the need arises.
Ran's boyfriend who loves para-para, to the point where he calls himself the "para-para king of Machida". He and Ran get along quite well, even though they don't really date, much less anything else romantic.
Voice Actors: Aya Ishizu (Japanese), Allison Sumrall (English)
Ran's rival and the "Queen of Ikebukuro". In the manga they later form a truce. This does not happen in the anime.
Clingy Jealous Girl: To Yuya. Justified by the long string of cheating boyfriends she had before him and her knowledge he was in love with Ran before they went together (and stayed in love with her for a while after: she mistook his attempt to play peacemaker during one of her fights with Ran as a love declaration, and acted on it). Becomes less jealous when Yuya realizes he has fallen for Mami and declares it in public.
Verbal Tic: she adds "datchu" at the end of her sentences. The dub changes it to "You bet."
Voice actors: Kazura Murai (Japanese), Allison Keith (English)
Miyu's very rarely seen mother, who treats her daughter rather poorly. She only appears in two episodes of the anime.
Abusive Parent/ Parental Abandonment / Parental Neglect: All of these. She rarely sees Miyu and blames Miyu for her divorce thus refusing to look at Miyu. She was abandoned by her own mother and in the end abandons Miyu. The only thing she does for Miyu is give Miyu enough money to live off of until Miyu gets a job and a place to stay on her own.