She's the Top Kogal of the Shibuya District whom has a family bloodline of police officers.
Ran was on the path against her father as a police officer. When she discovered the fact that as a police officer she wouldn't be allowed her favorite hair and assessors, her life took a different path. Now she rules the rules the streets of Shibuya.
Ran is stuck up and snobby with authority figures as well as her own family, but she has a heart of gold whenever it comes to friends and (especially) fashion. Her "heart of gold" is more active whenever a person (especially " Second Place") treats her for a bite to eat or does her homework.