Riko Mine  

Her plan was to make Aria and Kinji become partners so it could mirror the situation of Sherlock Holmes and Watson. Defeating both of them would mean she would become better than her ancestor Arsene Lupin who couldn't defeat Sherlock 100 years ago. She despises being called "4th" because she feels it removes her personal identity, as such she prefers "Riko". It soon turns out that after Riko's parents died in a car crash at the age of 8, Vlad took her in by pretending to be her relative but then locked her up in his dungeon to attempt to create an ideal 5th Lupin descendant, since Riko had failed to inherit her predecessors' superior gene, and was therefore deemed a failure. She was mistreated horribly while imprisoned; she was provided with only rags to wear, and had to sustain herself only on dirty water and rotten meat. Riko and Aria have similar traits: small stature, the title of "Quadra", twin-tail hairsyle (in Riko's case, her hair is not entirely split in half unlike Aria), and being the fourth generation of their families. She has a height of 147 cm (4'10") and weighs 54 kg. Riko and Aria have similar traits: small stature, the title of "Quadra", twin-tail hairsyle (in Rikos case, her hair is not entirely split in half unlike Aria), and being the fourth generation of their families. She has a height of 147 cm (410") and weighs 54 kg. It soon turns out that after Rikos parents died in a car crash at the age of 8, Vlad took her in by pretending to be her relative but then locked her Near the end of the first volume, Riko reveals that she is a descendant of Arsene Lupin. Although she is the descendant of Arsene Lupin, she was born with no special abilities. Her handguns are also a modern successor to Lupin IIIs signature weapon, the Walther P38.Her real name is Riko Mine Lupin IV. Riko also reveals that she is the Butei Killer. She appeared to have an inferiority complex concerning the first Lupin and wanted to escape his shadow. Her plan was to make Aria and Kinji become partners so it could mirror the situation of Sherlock Holmes and Watson. Defeating both of them would mean she would become better than her ancestor Arsene Lupin who couldnt defeat Sherlock 100 years ago. She despises being called "4th" because she feels it removes her personal identity, as such she prefers "Riko". It soon turns out that after Rikos parents died in a car crash at the age of 8, Vlad took her in by pretending to be her relative but then locked her up in his dungeon to attempt to create an ideal 5th Lupin descendant, since Riko had failed to inherit her predecessors superior gene, and was therefore deemed a failure. She was mistreated horribly while imprisoned; she was provided with only rags to wear, and had to sustain herself only on dirty water and rotten meat. Unsurprisingly, this experience has left significant permanent effects on her; for example, her being forced to wear only ragged clothing may have contributed to her developing a love for fancy clothing, and it is said that the malnourishment is the reason for her currently petite stature. Near the end of the first volume, Riko reveals that she is a descendant of Arsene Lupin. Although she is the descendant of Arsene Lupin, she was born with no special abilities. Her handguns are also a modern successor to Lupin III's signature weapon, the Walther P38.Her real name is Riko Mine Lupin IV. Riko also reveals that she is the Butei Killer. She appeared to have an inferiority complex concerning the first Lupin and wanted to escape his shadow.