Yukio Okumura

Yukio Okumura is the deuteragonist of the manga/anime series Blue Exorcist. He is also Rin's younger twin brother. A straight arrow and kind-hearted by nature, his goal is to become a doctor. Unbeknownst to his brother, he is a brilliant exorcist- the youngest in history- in short, a genius. His abilities are gradually unveiled during his time at the Exorcism Cram School.
He is voiced by Jun Fukuyama in the Japanese version of the anime and Johnny Yong Bosch in the English version, both of whom also voiced Lelouch vi Britannia.
==Appearance==
Yukio has brown hair and turquoise eyes. He also has three moles on his face and wears glasses (that's why Rin calls him Spotty-four eyes). In the first episode, Yukio wears a plain shirt with a beige cardigan. Later on in the episodes, Yukio has an exorcist coat that he wears over a white dress shirt and black dress pants. Over his coat he has a leather pallet of bullets and his guns. He has black leather shoes. and black socks. In his left breast pocket of the coat, He has a Knights Pendant. Colors of blue, red, and silver. He has two Springfield M1911A1 Champion pistols, both black with a glossy wood side cover on handle, and the True Cross insignia engraved into the slide. His height is 180cm (5' 11").
In the anime, he is seen with a mysterious black mark on the underside of his left arm that is now starting to spread throughout his body. This may have something to do with his original birth right as Satan's son and the demonic powers he was supposed to have shared with Rin as Yukio was shown preforming his daily testing and it reacted, but the mark was never fully explained in the anime (though Shura appeared to be alarmed by the sight of it). As of the last episode, Yukio's mark has spread all the way down passed his elbow. In the anime, since awakening his demonic powers in episode 22, Yukio now possesses the same demonic features as his brother, Rin when in their human form (e.g. the pointed ears and sharper fangs). When in his demon form, he too has a blue flame, pointed ears and fangs.
==Personality==
Although they are twins, Yukio is frequently noted to be the exact opposite of Rin, and Ryuji even states that he finds it hard to believe that they're related. Yukio is mostly seen as quiet and calm, but often has mood swings. He is usually seen happily smiling, but can easily get sidetracked due to Rin's personality clash, and becomes rather dark. He takes things seriously, but he knows a joke when he hears one.
Although he and Rin get along for the most part, Yukio is usually quite aloof towards his brother, finding him annoying and often scolding him for not thinking things through. He also has a secret resentment towards Rin, not only because he's a demon and the son of Satan, but also because he feels Rin is the one responsible for their adoptive father's death.
On few occasions, he is shown to have a very aggressive side, though he is very good at hiding it. If he is pushed too far, he can gain a fiercely angry personality. His angry side is so intense that it frightens Rin when it makes itself known. This may be as a result of his Demonic heritage even though he didn't acquire Satan's flames like Rin. The things that annoy him include, but are not limited to, people criticizing Shiro, Rin being "childish", Shura's teasing, being kept out of the loop, people asking him if he's alright and being called "weak".
He doesn't like to partake in 'unseemly' actions. He is usually punctual and lectures Rin on how to behave. As the manga goes on, Yukio gets more and more frustrated with his twin because Rin keeps doing things that put him at risk. While Rin finally accepts what he is and the fact that he is Satan's son, Yukio just can't seem to accept Rin as a brother like he used to.
==Powers & Abilities==
Yukio is an extraordinary Exorcist, graduating at the True Cross Academy before becoming the next teacher in Demon Pharmaceuticals. Despite being one of the fraternal twins of Satan, Yukio did not inherit the blue flames. However he did acquire his mashou ("Spirit Wound") from his brother Rin at birth. Being trained and raised at the age of 7 by Shiro Fujimoto, a former Paladin, Yukio was able to graduate at the academy at age 13, then becoming one of its teachers 2 years later. This made him the youngest exorcist and teacher ever.
===Doctor===
As one of the youngest doctors in the True Cross Order, Yukio's medical abilities are top notch. He was able to treat Noriko Paku after being injured by a Naberius that Igor Neuhaus summoned, after being treated by Shiemi. In the manga, during the theft of the left eye of the Impure King, he cured a child named Satoru by inserting needles into the miasmatic boils on his body without rupturing the membranes of the cells, demonstrating his advanced knowledge of cellular biology- this is made further impressive as at the time, Yukio was also infected by the miasma while left reeling by the words of a possessed Saburota Todo. When he and his brother were young, he would treat Rin's injuries when ever he came home after getting into a fight.
===Dragoon===
Yukio's second and offensive meister is Dragoon, a gunslinger. Yukio can shoot his targets with impressive accuracy, all the while maintaining a calm and even disposition. He has demonstrated the ability to shoot demons behind his back without looking at them, as well as destroying giant demons with his hand guns. Yukio's weapons of choice are Dual Handguns (he may have skill in wielding other fire arms) that may have been modified for rapid fire. He is able to keep up with Shura, an Exorcist 2 Ranks above him, in a combat simulation test. Yukio also has some knowledge of the fighting elemental demons, as shown when he fought a fire demon using water-attributed bullets.
===Tamer (Manga Only)===
Although Yukio doesn't have a title as Tamer, it has been shown that he can summon multiple water Naiad's and also perform a Water Dungeon spell with them. However, Yukio's lack of stamina in summoning demons makes it difficult to maintain the summoning for long periods of time. Saburōta notes that this is the first time Yukio has summoned.
===Demon Form (Anime only)===
He is shown to have demonic powers in him later in the anime, allowing Satan to possess him without any danger as a perfect vessel. He also is shown to have blue flames like Rin and his blood is that of a demon's. 
Although his demonic form has only been revealed in the anime, it has been revealed in the latest chapter of the manga that Yukio has, indeed, inherited some of Satan's demonic powers. Whether or not this results in demonic physical characteristics has yet to be shown. They say that his eyes are not his. We do not yet know what this means.
==Trivia==
*According to the Ao no Exorcist Guidebook, Kazue Kato said that originally, Yukio and Rin aren't exorcists, but anti-paranormal agents who exterminated supernatural creatures.
*He is popular with girls, though he finds it difficult to reject them.
*Favourite food is seafood, especially sashimi.
*His known pastimes are: formulating plans and reading Jump Square every month.
*His favourite manga genres are: comedy, horror, suspense.
*He averages 4 hours of sleep each night.
*He is ranked 5-6th on Rin's 'cool dude' list. The same rank as Kuro, Rin's familiar.
*He is embarrassed and extremely bothered by how many moles he has.
*He gets irritated with Shura ever since they were young because he always gets defeated by her.
*He is ambidextrous meaning he is dexterous with both hands and has used this to his advantage, combining it with multi-tasking. This ability shines through when he is in battle. (This was also shown in the bonus picture of Ao no Exorcist volume #3.)
*He has extremely poor eye-sight, which may have been affected by his demon-heritage in the manga.
*The original concept had Yukio and Rin's names switched around, therefore, his name was Rin. His hairstyle was also similar to Rin's.
*Kazue Kato intended on giving him stress-related asthma, making him always having a puffer around. This concept had him slightly psychic and sometimes prescient. It is also said that he was supposed to be interested in computers and a feminist.
*Yukio (幸雄) means "blessed hero".
*There was an error in the official English translation of Blue Exorcist Volume 2 where Yukio was a meister in Aria and Dragoon. This is false, Yukio is both a Dragoon and a Doctor, not Aria. This was shown in the character profile of Blue Exorcist Volume 1.
*As of the 30th Chapter of the manga series, it is discovered that his eyes can somehow change to other eyes, who were not his own. This is hinting that he has inherited Satan's eyes and that he may also have demonic powers as well, possibly latent due to his body's sickly disposition when he was born.
*His Japanese voice actor, Jun Fukuyama, also voiced Riku in Yashahime: Princess Half-Demon, Ren Amamiya in Persona 5, Korosensei in Assassination Classroom, Yuuta Togashi in Chūnibyō Demo Koi ga Shitai!, Lelouch vi Britannia in Code Geass, King in The Seven Deadly Sins, Teruteru Hanamura in Danganronpa 2: Goodbye Despair, Roy in Super Smash Bros. Melee, Yumichika Ayasegawa in Bleach, Rikuo Nura in Nura Rise of Yokai Clan, Shinra Kishitani in Durarara!, Ultraman Mebius in Ultraman Ginga S Movie, Kimihiro Watanuki in xxxHolic, Kazuki Muto in Buso Renkin, Joe Shimamura in Cyborg 009 VS Devilman, Albert de Morcerf in Gankutsuou: the Count of Monte Cristo, Kazuma in Noragami, Kraft Lawrence in Spice and Wolf, Yuusha in Maoyuu Maou Yuusha, and Finral Roulacase in Black Clover.
*His English voice actor, Johnny Yong Bosch, also voiced Zhang Bao in Dynasty Warriors series, Hovernyan in Yo-Kai Watch, Hajime Hinata in Danganronpa, Ichigo Kurosaki and Zangetsu in Bleach, Makoto Tachibana in Free!, Kiba in Wolf's Rain, T.K. Takaishi in Digimon Adventure tri., Nobita Nobi in Doraemon, Adam Park in Mighty Morphin Power Rangers, Sabo (adult) in One Piece: Stampede, Rantaro Amami in Danganronpa V3: Killing Harmony, Lelouch vi Britannia in Code Geass, Kung Jin in Mortal Kombat X, Yu Narukami and Tohru Adachi in Persona 4, Giyu Tomioka in Demon Slayer: Kimetsu no Yaiba, Zora Ideale in Black Clover, Jonathan Joestar in Jojo's Bizarre Adventure: Phantom Blood, Shotaro Kaneda in Akira, Lio Fotia in Promare, Zero in Fate of Two Worlds, Nero in Devil May Cry 4, Firion in Final Fantasy II, Renton Thurston in Eureka Seven, Eriol Hiiragizawa in Cardcaptor Sakura, Joe Shimamura in Cyborg 009 VS Devilman, Vash the Stampede in Trigun, Brad Vickers in Resident Evil: The Umbrella Chronicles, Yukimura Sanada in Sengoku BASARA, Albert de Morcerf in Gankutsuou: the Count of Monte Cristo, Artemis in Sailor Moon franchise, Orga Itsuka in Mobile Suit Gundam: IRON-BLOODED ORPHANS, Itsuki Koizumi in The Melancholy of Haruhi Suzumiya, Dae-hyun in Overwatch, Kento Hinode in A Whisker Away, Rossiu Adai in Gurren Lagann, Dracomon in Digimon Fusion, Ryuto in Mugen Souls, Broly in Dragon Ball Super, Bumblebee in War for Cybertron, in Stich, Yang in Super Street Fighter IV, Xi-Qi in Darker Than Black: Gaiden, and Xiba in Soulcalibur V.
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