Aria Holmes Kanzaki, also known as Sherlock Holmes IV, is the main female protagonist and title character of the Hidan no Aria anime and light novels.
A diminutive top student of Butei High's prestigious Assault Side. Looking for a fitting partner, her attention falls on Kinji, whom she quickly declares her "slave". She is also the great-granddaughter of the most powerful and intelligent detective in history, Sherlock Holmes.
In the AWA fics, Aria is a student at the AWA Academy.
In the XP4 fics, Aria debuted in XP4 Heroes Coalition - Kick-Off!.
She has ankle-length pink hair tied in two pigtails that reach her knees. Her ponytails are decorated with red horn-shaped hairpins. Aria also has big red eyes.She mostly wears the standard uniform of Tokyo Butei High School, and wears black thigh-length stockings as well. Aria hides a pair of guns under her skirt. She has a rather big forehead, something she's proud of and Kinji tends to tease her about. To better display it, she wears a gold heart-shaped hair pin (Pink in the AA anime) that holds her bangs up. However, she received a scar on her forehead during a mission against the Butei Killer so she was forced to cover up her forehead.
It is later revealed that her hair and eye color are originally flax blonde and blue 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 one's body. This is why Aria, despite being 16 years old, has a childlike body. Aria has a height of 142 cm (4'8") and weighs 34 kg (75 lbs). She has a complex about her height and flat chest.
Her hair style was revealed by Sherlock Holmes to be the common hair style for all women of the Holmes family. The reasoning behind it, according to Kinji, was so Sherlock, and anyone skilled enough, could read the movements of the woman based on the movements of how their twin tails move about. It can be inferred that the actual purpose was different after Aria and Kinji's intrusion on IU, her long twintails serving to protect them from free fall thanks to the irokane in her body.
Aria is a haughty girl who prioritizes herself most of the time. She is a very loud and outspoken person, and always expresses her opinions shamelessly. Unfortunately, this pride is one of many traits she has which prevent her from focusing properly on social interaction and human empathy, which in turn kept her from having true allies until she met Kinji. Indeed, Aria is shown frequently to be socially inept, as she doesn't seem to see anything wrong with a girl staying the night in a boy's dorm room and believes merely being kissed can cause a girl to get pregnant, though she was told the latter by her father.
Aria is often very bossy and immature, such as when she more or less barged into Kinji's dorm room and declared him her slave, though it's later revealed that she was simply too proud to say "partner." She is incredibly short-tempered, often threatening to shoot Kinji or anyone else who annoys her. What makes her angrier than anything else, however, is whenever someone brings up relationships. Aria is a celibate (someone who has no interest in romantic or sexual relations), claiming that relationships are nothing but a waste of time, and even goes so far as to look down on people who think otherwise. Plus, Aria will distance herself from people who have hurt her really badly or betrayed her as shown when she ends her friendship with Reki after she claims Kinji as her husband and sees Kinji as a traitor when he was trying to make peace with Kaname, the person who attacked her and the other Baskerville girls, creating a deconstructing relationship between the two.
Aria is also unshakably determined, and makes it clear early on that she hates people who use words like "tired" and "impossible", claiming they're just excuses people use to hide that they are scared of their full potential. However, Kinji suspects her attitude towards those words are actually the result of being an aristocrat and growing up in a society of "winners", which has resulted in a lack of understanding for those who are weak, poor or hopeless. She is also very stubborn and prideful and hates to admit when she's made a mistake, to the point that she'll often demand proof from people before she'll believe something that goes against her initial assumption. In addition, she is very much the kind of person who doesn't take 'no' for an answer, going so far as to stay the night in Kinji's apartment until he reluctantly agreed to become her partner.
Despite her immaturity and egotistical attitude, Aria is very dedicated to her loved ones and cares for them deeply, especially her mother and Kinji. She is extremely loyal to and trusts her fellow Butei, since the first rule of being a Butei is to put one's faith in others, and is even willing to risk her life to save someone she doesn't know, which is how she and Kinji first met. She's also aware that she can be overbearing at times, though she nevertheless insists that it's for her friends' own good. She loves cute things and sweets, especially peach buns, to the point that she ate at least seven on the night of the day she first met Kinji, much to Kinji's confusion since he doesn't consider peach buns to be particularly tasty. Despite her battle skill, she is scared of thunder and is still able to feel fear whenever she goes too far like when Kinji gets really angry. Additionally, Aria is a lot more fragile than she likes to admit; although she pretended she didn't care at the time, Kinji saying he despised her shortly after they met really hurt her and it takes him kissing her to convince her that he doesn't.
While she's certainly intelligent, Aria inherited none of her ancestor's incredible deduction abilities, and is called the "Defective Holmes" as a result. Interestingly, she seems to have no problem with admitting this flaw, despite her otherwise prideful nature. To make up for this, Aria has a tendency to rely on her intuition, such as when she is convinced for certain that Shirayuki is being targeted by Durandal. Unfortunately, due to her inability to explain her theories logically, no-one ever believes her, much to her endless frustration. Aria has also shown the capacity to learn from her mistakes and know her limits, as shown when she gets Shirayuki to form a trio with her and Kinji after they defeat Jeanne, as they were only able to defeat her via the three of them working together.
Aria is a member of the Heroes Coalitions and is part of Of Guns and Magic. She also attends at Vanguard Academy as a student.
XP4 Heroes Coalition - Kick-Off!
In Chapter 10, Aria, alongside her team, Of Guns and Magic, are seen in the kingdom of Reste Sig where they had a mission to defeat the rebellion going against the Royal Blomma Family. After driving away the rebels, Aria and everyone were ordered to stay in the kingdom for a while until all rebels are captured which they complied.
Aria is armed with a two Custom, Colt Government Model M1911, two Twin Kodachi and a Hover Skirt YHS/0.
Firearms Usage - Aria is very proficient at using fire arms and is skilled enough to effectively and accurately dual-wield her pistols.
Close Quarters Combat - Aria appears to be proficient in Vale Tudo, a Brazilian martial art that specializes in full body grappling and striking techniques. Despite her small stature, she is exceptionally strong and is capable of performing acrobatic feats. Her small stature is also one of her best advantages as she can strike and disengage quickly.
Aru=Kata - Combining her expertise with her pistols and proficiency in Vale Tudo, Aria is deadly in Aru=Kata, the art of fighting at close combat with fire arms. She's able to effectively wield her pistols as both melee weapons to hook and disarm opponents in addition to being able to control her accuracy in very close quarters.
Baritsu - A hand-to-hand combat style perfected by Sherlock Holmes and passed down throughout her family.
Quadra Proficiency - Earning her the title of "Quadra," Aria is very skilled in the use of her twin Kodachi. Much like her pistols, she wields both swords in combat.Though, she has yet to be seen using a pistol and sword in combat
Holmes Intuition - Being a descendant of Sherlock Holmes, Aria possesses the intuition members of the Holmes bloodline has. However, due to her unusually hot-headed and short tempered personality, her deduction skills aren't particularly good. As such, she is unable to explain her intuition logically, resulting in nobody ever believing her, as shown in the Durandal case. Explaining or breaking down the situation is difficult for her due to being unable to properly clam herself down, often resulting in confusing or poorly worded conclusions.
Multilingualism - During their stay at the Dracula summer home, Aria states that she is fluent in 17 languages, of which include Japanese, English and Romanian.
- Aria is the first character from Hidan no Aria to be introduced in the AWA fics.
- In the AWA fics, Aria is amongs the confirmed people who hates Chizuru Tachibana.
- Aria is named after the musical term aria, which is a solo melody sung in an opera. This is fitting, as she worked alone for a long time before meeting Kinji, which the two discuss.
- Aria hairstyle is similar to Kotori Itsuka from Date A Live, Mine from Akame ga Kill!, and Enju Aihara from Black Bullet.
- Aria along with Akari's hair styles, weapons, and uniforms can be purchased in Sega's Phantasy Star Online 2.
- Aria has a fondness for cats.
- Aria makes a cameo in the anime Mayo Chiki.
- Aria is unable to swim.
- In the end credits of the anime, when Aria is making her fingers into a gun and pretending to fire, it is similar to Spike Spiegel final moment in Cowboy Bebop.