Ran "Ran Ishihara, Ji-ran Yu" Nikaidou
About
A mysterious girl who is the most powerful Psychopath-class Taker. She hunts other high-level takers. She saves Ayaka, who is being forced by the ruthless Nykaa, on a whim. She is in an antagonistic relationship with Life Inc.
Ran later appears in the sequel, being around 27, now taking care of the younger siblings of her deceased savior. For unknown reasons, Ran has lost access to her rather abundant wealth, now living an austere lifestyle and working part-time.
(Source: Re:BIRTH - The Lunatic Taker Fandom Wiki)