|Name in Japanese||峰理子|
|Romaji Translation||Mine Riko|
|Debut (Anime)||Episode 01|
|Debut (Light Novel)||Volume 01(2nd Ammo)|
|Appears in||Anime, Light Novels, Manga|
|Voice Actor (Japanese)||Mariya Ise|
|Voice Actor (English)||Luci Christian|
|Nationality||1/4 French, 3/4 Japanese|
|Skill Rank||Rank A|
|Title (s)|| Butei Killer|
Walther P99 Pistol (two)
Lupin the 3rd (Father)
|“|| I'm not gonna forgive you if you are killed by someone other than me!
...And Also I Have A Midget Gun!
–Riko Mine Lupin the 4th (峰 理子 Mine Riko)
?</sup>) is a female student of Butei High school. She is a friend of Kinji's, whom she calls Ki-kun, and is enrolled with him in the Butei Inquesta department. She is ranked A, despite this she is known as the biggest idiot in Kinji's class but she seems to hold a lot of information including info on the students of Butei High school. Riko is apart of Team Baskerville (Aria and Kinji are suspicious that she will betray them), who chose the affiliation Deen, yet the most of IU choose Grenada, and she was formerly part of that group. It is unkown on which side she will act on.
Near the end of the first volume, Riko reveals that she is a descendant of Arsene Lupin, thus her real name is Riko Mine Lupin IV. Although she is the descendant of Arsene Lupin, she was born with no special abilities. Because of her genetic deficiency, she honed her combat ability to make up for it. Thus, she is a Quadra due to her proficiency with two pistols and twin daggers.
It soon turn out that after her parents die in a car crash at the age of 8, Vlad took her in by pretending to be her relative but he locked her up in an underground dungeon to conduct an experiment in creating an ideal 5th Lupin. As it turned out that Riko didn't inherit the Lupin bloodline's superior gene, she was branded a failure. She has been imprisoned there for a long time and was forced to eat rotten meat and drink muddy water to survive. It was said that because of her malnutrition that she has a present small stature. And because she could only wear ragged clothes in the whole time of her imprisonment, she developed a love for fancy clothes.
Riko also reveals that she is the Butei Killer. Although she states that the name is wrong as she never killed any of her victims, but instead she was the one that kidnapped those who had disappeared. 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 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".
Her most valued possession is a cross made of Irokane. This cross allows Riko to control her hair at will. She hides it under her tongue when she was imprisoned naked in an underground dungeon. Vlad eventually steals this cross, prompting a series of events in which Kinji and Aria retrieve it by infiltrating Vlad's place.
Riko is very short, around the same height as Aria at 147 cm (4'10"). She has long, blonde hair that falls below her waist and has twin tails styled on the side of her head. Despite having an overall appearance similar to Aria's, Riko's bust is considerably larger than Aria's (much to Aria's jealousy). She often wears a gothic lolita modified Butei High uniform but she also enjoys wearing maid outfits.
Typically, she is a rather scatter-brained and playful. She loves giving nicknames to others (Kinji as Ki-kun, Reki as Rekyu, etc.).
During tough situations, however, she breaks this facade. Kinji calls this side of her personality "Dark Riko". With the facade removed she uses rough language, her eyes emit an intimidating glare and she refers to Aria as Holmes (French: Olmes) instead of Aria. She is also one of the few people who knows Kinji's secret . Riko loves to sexually tease Kinji.
Riko also has a fondness for fancy clothing, especially that of Gothic lolita sohe likes customizing her uniform into Lolita style. She's also a major otaku and loves playing dating sim video games to the point where she regularly attends comikets and often puts things into dating sim terms.
- Riko's last name, "Mine", is a tribute to Fujiko Mine from Monkey Punch's Lupin III.
- Riko in episode 4 alleged that Kinichi is her boyfriend/lover.
- Riko makes many attempts on having sex with Kinji
- Riko easily gets "turned on". Ex (From the LN): "Abnormally excited, Riko stuck her hands into her blouse, making what appeared to be punching movements from inside."
- All her clothes can be used as a parachute.
- Riko's height is directly caused by the lack of nutrients from her childhood imprisonment.
- Of Riko's many disguises, one of them was Kinichi's alter ego Kana
Mine Riko on the Heroes wiki.