Aria H. Kanzaki

"I'll blast a big hole in you!"

a.k.a. Sherlock Holmes the 4th, is a female transfer student of Butei High school. An "Assault" department elite rank S (The highest rank) Butei, she wishes to recruit Kinji as a partner after their encounter. She can wield two guns or two swords at the same time, earning the title of a "Quadra". Her main goal is to defeat the IU and exonerate her mother. She also starts to have feelings for Kinji but shows it in a different way than other people.

Appearance
She is a girl with very long strawberry blonde hair tied in two ponytails. Her hair accessories are decorated with pink cone-shaped objects that look like tiny horns. Aria also has camellia-colored irises. Aria is most of the time dressed in the standard uniform of Tokyo Butei High School, and wears black thighhighs.

It is later revealed that her hair and eye color are originally flax blonde hair and azure respectively, and the drastic change was caused by a Hidan bullet embedded in her body. The Hidan bullet also has the ability to extend a person's lifetime, but at the same time, it will heavily delay all growth in ones body. This is why Aria, despite being 16 years old, possesses a petite physique.

Personality
Aria is considered to be a tsundere, who prioritizes her own pride most of the time. She is self-centered, belligerent, has an immature attitude, and blushes quickly.

History
Aria has a background as a Butei in Europe, namely England, and this is attributed to her lineage as a descendant of Sherlock Holmes. Aria seems to have started becoming a Butei there, and so this is most likely where she has earnced her title of Quadra and her S-Rank. It has been mentioned that she has received the title of "Dame" and even been opportioned a piece of territory she recalls to be called "Baskerville".

Equipment
Her weapons of choice are M1911 pistol (also known as Colt Government) for guns, and two undersized Japanese swords known as "Kodachi".

Abilities
Aria is an extremely skilled close ranged fighter, being and S-Rank Assault. She is extremely capable in Aru=Kata gunfights and close quarters combat as well. Aria is also capable of impressive acrobatic feats and physical strength.

Aria seems to have taken up Close Quarter Combat training in the area of Vale Tudo, a Brazillian martial art technique.

Aria possesses twin "Kodachi" or "Wakizashi" hidden in the back of her uniform, and she can use these to an impressive degree as well. How they don't hinder her in battle remains to be seen.

Kinji Tohyama
Aria finds Kinji idiotic in most cases, which leads to the nickname she gave him: "Idiot Kinji". Aria, however, deeply cares for Kinji as a friend, but she just doesn't show it due to her prideful nature. An example is when Kinji got sick, and Aria took the trouble of purchasing medicine for him from a far-ish location, but she didn't outright tell him.

Aria may have fallen in love from Kinji from Episode 1, however it was his Hysteria Mode personality she found highly attractive. But later on in the series, it is constantly shown she actually harbors romantic feelings for Kinji and is just afraid to express her emotions and is also too prideful to do so. Instead, she keeps Kinji in a locked-relationship and doesn't allow Kinji to move in on other girls and vice-versa.

Reki
Aria considers Reki somewhat like a friend, even though the two don't necessarily socialize. This is due to both having similar traits: both being S-Rank and are short, petite girls. Aria also respects Reki, and it should be vice-versa.

However, Aria may see Reki as an extremely powerful rival in the war over Kinji's affections, and the events shown in Light Novel Volume 6 have shown that Aria was willing to break off their "friendship" over Reki's actions. However, the two now see each other as equal respectable rivals.

Kanae Kanzaki
Aria is Kanae's daughter, and loves her very much, to the point where she'd be willing to put her life on the line to prove she's innocent.

But like most mothers, Kanae has the capacity to embarass Aria in a tight situation (Episode 3).

Trivia

 * According to Riko's information gathering about Aria, her mother is Japanese and her father is half British.
 * Aria is from Europe Butei High and she's been there since she was 14 years old.
 * Her real hair colour is flax blonde and her real eyes colour were azure, she changed to strawberry blonde and camellia colour respectively after Sherlock shot Aria three years ago due to the Hidan properties inside her body.
 * She speaks 17 languages.
 * She does not know how to swim.
 * Her grandmother is a member of the British Royal Family and she has the title of dame.
 * Aria is scared of thunders/lightnings.
 * Aria loves Matsumoto peach buns.
 * She is voiced by Rie Kugimiya, who also voiced more tsundere characters.