A top student of Assault Side, who, for some reason, demoted himself to the more rear-line Inquest Side. When sexually aroused, he enters a state called "Hysteria Savant Syndrome" (HSS), also known as "Hysteria Mode".
Blessed with Suck/Cursed with Awesome: HSS grants him superhuman abilities, but it is only activated by sexual arousal, and under such a state Kinji turns into a suave ladykiller, which he thinks is detrimental to his academic life.
Humiliation Conga: He was forced to mull leaving Butei after he and his (supposedly-dead) older brother Kinichi was subjected to this after the latter's rescue attempt aboard a sinking ship, but with the shipping company unwilling to take responsibility and instead scapegoating him.
Lolicon: Mistaken by his classmates as one due to his closeness to the diminutive Aria. It also doesn't help that she is the most effective catalyst for his HSS. For example, in Episode 10, he managed to resist arousal from Riko in just her lingerie, but couldn't hold on any longer once he saw Aria taking off her clothes.
Weapon of Choice: A Beretta 92FS Inox modified to fire a three-round burst, which he conveniently names "Beretta Kinji Model", as well as a butterfly knife.
Animal Motifs: Cats. She is fond of "Leopon" stuffed cats, some key scenes involving her have random purrs, and in Episode 2 she even growls like a cat. In Episode 6 Shirayuki even calls her a "thieving cat"*
A derogatory term to a female romantic interloper; this is frequently used in Japanese live-action drama shows
Clear Their Name: Aria's primary motivation for attending Butei High is to help clear her mother, Kanae, of charges of being the "Butei Killer", which automatically sent her to 862 years in prison. If successful, Aria could shave off centuries of prison time for her, and at the best-case scenario, even clear her altogether.
Fear of Thunder: She's quite afraid of thunder. This presents problems in missions where it's raining.
First Kiss: With Kinji, which also doubles as a "Shut Up" Kiss to her in order to pacify her after she was revived after being critically hit in the chest by Riko.
Scars Are Forever: After a brush with death during the bus bomb incident, she has since kept a small X-shaped scar on her forehead (now hidden by her hair) as a reminder.
Shana Clone: And possibly the 5th Tsundere Wonder.
The Three Faces of Eve: The Child (diminutive and temperamental, with bouts of innocence).
According to IMFDB, her weapons are a pair of customized Colt Model Governments, which is a civilian variant of the of the military issued Colt 1911A1 used in World War II.
Black Bra and Panties: She has loads of them, as well as white ones, as Kinji found (much to his horror) when he opens a drawer she brought with her when she moved into Kinji and Aria's place.
Chekhov's Gun: Becomes a plot point when Jeanne disguises herself as her.
Broken Bird: Implied — as a child she was not allowed to go outside, and was severely punished for going out with Kinji. She was also only able to attend Butei High due to her clan's approval.
The Three Faces of Eve: The Wife (a mild-mannered, albeit potentially violent Yamato Nadeshiko, who has considerable domestic skills, especially cooking, and extremely devoted to Kinji).
Yamato Nadeshiko: A miko according to family tradition and practices with a katana.
Emotionless Girl: As a member of the Ulus Tribe, she sealed away her emotions inside a sliver of irokane in exchange for efficiency and utter devotion to her chosen husband (i.e., Kinji).
A ditzy, air-headed Butei High student and a reliable source of information.
Animal Motifs: Like Aria, Riko has her own share of feline characteristics, with her Cat Smile as the most evident one. Shirayuki even calls her "the other thieving cat".
Freudian Excuse: Sick of being constantly referred to as "Lupin the 4th" by Vlad (pretending to be a relative), Riko was forced to join I-U, hoping to kill a Holmes and finally break free of her great-grandfather's shadow.
I Am Not My Father: Ultimately subverted in the end, when, after defeating Vlad, who brainwashed her into doing his bidding by hammering the title onto her, she regains her pride of her heritage as Lupin the 4th.
Born in the Wrong Century: As noted by Kinji, Jeanne shows shades of this. She's refined, wears plate mail, wields a zweihander (two-handed sword), doesn't know what a vending machine is, and dislikes skimpy clothing (including modern school uniforms, even her Butei uniform). This may have stemmed from growing up without seeing the world beyond I-U's auspices.
Covert Pervert: Thanks to fellow Frenchwoman Riko's influence, the once very conservative Jeanne is starting to collect Meido uniforms, Elegant Gothic Lolita outfits, etc.
Expy: She could be easily mistaken for a younger, Francophone Saber Lily with longer silver hair, shorter skirt, and a near-identical sword — with the same seiyuu to boot, to near-Casting Gag levels.
Bash Brothers: He and Kinji used to be paired together prior to the latter's transfer to Inquest. Upon returning to Assault, however, Kinji already paired up with Aria.
Broken Pedestal: Kinji used to look up to him before he died and was defamed partially as a result of his hysteria mode. He remains disillusioned, even after meeting him again.
The Mole: He is actually trying to take down I-U by creating a power vacuum though his methods are...a bit extreme
Not Good with People: More like unable to communicate well without her equipment. This is what's keeping her stuck as a B-Rank despite being an excellent Mission Control.
Aria's mother currently spending an absurdly long 862 years in prison for charges of being the "Butei Killer".
Clear My Name: Aria's motivation for attending Butei High is to clear her of charges of being the "Butei Killer". If successful, she could shave off centuries of prison time for her, or perhaps even clear her altogether.
