Koku is one of the main characters in B: The Beginning. He works as a Violin Craftsman under Lily's father and has the ability to transform into a black-winged, heteromorphic being. He is also the true identity of Killer B, a name derived by his unusual way of writing the number "13" at his murder sites.

~!Since the attack on Jaula Blana orchestrated by Gilbert Ross that took the lives of several of his classmates including Dr. Heath Flick, Koku has spent the last seven years in search of his love, Yuna, in hopes of reuniting with her.!~

In a world powered by advanced technology, crime and action unfold in the archipelagic nation of Cremona. Koku, the protagonist. Keith, the legendary investigator of the royal police force RIS. A mysterious criminal organization. A wide variety of characters race through the fortified city as it is beset by the serial killer, Killer B, and a chain of crimes. 
(Source: Netflix, edited)

[Profile](https://vims.co.jp/talent_profile_detail.php?id=7) | [Twitter](https://twitter.com/kaji__official) | [Instagram](https://www.instagram.com/yuki_kaji_official/) | [YouTube](https://www.youtube.com/channel/UCx2XAGS0FoG9S6r0bhNo2UA)

Kaji has won several awards, including Best Voice Actor at the 12th Tokyo Anime Awards (2013), Best Actor at the 7th Seiyu Awards (2013), and Best Voice Actor at the 36th Anime Grand Prix (2014).

Married voice actress [Ayana Taketatsu](https://anilist.co/staff/101996/) in 2019.

__Non-Anime Roles:__ 
~! Abe (Abraham Attah) in "Spider-Man: Homecoming" (live-action film) (Japanese)
Ace in "Final Fantasy Type-0" (VG) (Japanese)
Adol Christin in "Ys VIII: Lacrimosa of Dana" (VG) (Japanese)
Adol Christin in "Ys: Foliage Ocean in Celceta" (VG) (Japanese)
Akio Fudo in "Inazuma Eleven 2" (VG) (Japanese)
Akio Fudo in "Inazuma Eleven 3" (VG) (Japanese)
Akio Fudo in "Inazuma Eleven Strikers" (VG) (Japanese)
Akira Shimotsuki in "Watashi ni xx Shinasai!" (Drama CD) (Japanese)
Alex in "Don't Breathe" (live-action film, BD & DVD release) (Japanese)
Arahagi in "Yuugen Romantica Hatenkou: Dai Roku no Nazo - Bakeneko Arahagi" (Drama CD) (Japanese)
Arahagi in "Yuugen Romantica Uchouten: Dai Roku no Nazo - Bakeneko Arahagi" (Drama CD) (Japanese)
Arahagi in "Yuugen Romantica: Dai Yon no Nazo - Bakeneko Arahagi" (Drama CD) (Japanese)
Ayerscarpe in "Arknights" (VG/Mobile) (Japanese)
Ayn Talfryn in "Tales of Zestiria" (VG) (Japanese)
Basil Sabanci in "Valkyria: Azure Revolution" (VG) (Japanese)
Bhunivelze in "Lightning Returns: Final Fantasy XIII" (VG) (Japanese)
Brainy Smurf in "The Smurfs" (animated TV series/Animax dub) (Japanese)
Bren Turner in "E.X. Troopers" (VG) (Japanese)
Cecil in "Hortensia Saga" (VG) (Japanese)
Dick Grayson/Robin (Brenton Thwaites) in "Titans" (live-action web series) (Japanese)
Eight (VIII) in "Super Smash Bros Ultimate" (VG) (Japanese)
Eln in "Age of Gunslingers Online" (VG) (Japanese)
En Shinohara in "Usotsuki Lily" (VOMIC) (Japanese)
Enji Tsuzuri in "Boku to Majo no Jikan" (VOMIC) (Japanese)
Erik in "Mōjū-tsukai to Ōji-sama ~Flower & Snow~" (VG) (Japanese)
Flynn in "Shin Megami Tensei IV" (VG) (Japanese)
Flynn in "Shin Megami Tensei IV: Final" (VG) (Japanese)
Fudou Akio in "Inazuma Eleven 3 Sekai e no Chousen!! Spark/Bomber" (VG) (Japanese)
Ganryū Hanakiri in "Otome Youkai Zakuro Vol. 10 Limited Edition Drama CD" (Drama CD) (Japanese)
Gaon in "Kikai Sentai Zenkaiger" (TV series) (Japanese)
Hayato Ozaki in "Nil Admirari no Tenbin Teito Genwaku Kitan" (VG) (Japanese)
Hero in "Gensosuikoden Tierkreis" (VG) (Japanese)
Hikaru Seto in "Cheer Boy! vol.3" (Drama CD) (Japanese)
Hinata in "Aigan Shounen" (Drama CD) (Japanese)
Hitoshi Taniguchi in "Reinouryokusha Odagiri Kyouko no Uso" (VOMIC) (Japanese)
Hope Estheim in "Final Fantasy XIII" (Japanese)
Hope Estheim in "Final Fantasy XIII-2" (VG) (Japanese)
Hope Estheim in "Lightning Returns: Final Fantasy XIII" (VG) (Japanese)
Hoshiguma Doji in "Onmyoji" (VG) (Japanese)
Hyuuga Masamune in "Touken Ranbu" (browser game) (Japanese)
Ichinose Kazuya in "Inazuma Eleven 3 Sekai e no Chousen!! Spark/Bomber" (VG) (Japanese)
Ikuto Taki in "RUNLIMIT Case 2" (Drama CD) (Japanese)
Jean Pierre in "Counter Strike Online 2" (VG) (Japanese)
Johnny Joestar in "JoJo's Bizarre Adventure: All Star Battle" (VG) (Japanese)
Kakeru in "Yandere Heaven Vol. 1" (Drama CD) (Japanese)
Kanato Sakamaki in "Diabolik Lovers" (VG) (Japanese)
Katai Tayama in "Bungou to Alchemist" (VG) (Japanese)
Kazuya Ichinose in "Inazuma Eleven 2" (VG) (Japanese)
Kazuya Ichinose in "Inazuma Eleven 3" (VG) (Japanese)
Kazuya Ichinose in "Inazuma Eleven Strikers" (VG) (Japanese)
Kei Okazaki in "Collar x Malice Character CD Vol. 2 Okazaki Kei" (music/Drama CD) (Japanese)
Kei Okazaki in "CollarxMalice -Unlimited-" (VG) (Japanese)
Kei Okazaki in "CollarxMalice" (VG) (Japanese)
Keisuke Takagi in "Devil Survivor Over Clock" (VG) (Japanese)
Kentucky in "Sen Jyushi" (VG) (Japanese)
Leonis in "Record of Agarest War Zero" (VG) (Japanese)
Link in "Hyrule " (VG) (Japanese)
Luy in "Kamigami no Gosui" ("Siesta of the Gods") (Drama CD) (Japanese)
Luke Pearce in "Tears Of Themis" (mobile game) (Japanese)
Michizane in "Ichibanketsu Online" (VG) (Japanese)
Norman in "The Secret Life of Pets" (animated film) (Japanese)
Prince of Darkness in "Shironeko Project" (VG) (Japanese)
Rath in "Black Wolves Saga" (VG) (Japanese)
Rikka Toratani in "Storm Lover V" (VG) (Japanese)
Roche in "BLUE ROSES ~Yousei to Aoi Hitomi no Senshitachi~" (VG) (Japanese)
Sakamaki Kanato in "Diabolik Lovers Blood & LoveSweat" (Drama CD) (Japanese)
Sakamaki Kanato in "Diabolik Lovers MORE,BLOOD" (VG) (Japanese)
Sakamaki Kanato in "Diabolik Lovers VERSUS 3 Kanato VS Reiji" (Drama CD) (Japanese)
Sakamaki Kanato in "Diabolik Lovers ~Haunted Dark Bridal~" (VG) (Japanese)
Seth in "UNDER NIGHT IN-BIRTH" (VG) (Japanese)
Shiina Kiya in "PsychicEmotion6" (VG) (Japanese)
Syogo Shiratori in "Kizuna Striker!" (VG) (Japanese)
Takumi in "Fire Emblem Fates" (VG) (Japanese)
Takumi in "Fire Emblem Heroes" (VG) (Japanese)
Tega Sword in "No.1 Sentai Gozyuger" (TV series) (Japanese)
Thomas Edison in "Rinka Nation" (VG) (Japanese)
Thomas in "Antique Carnevale" (VG) (Japanese)
Tokugawa Iemitsu in "Akasasu Sekai de Kimi to Utau" (mobile game) (Japanese)
Tot in "Skyover" (VG) (Japanese)
Touma in "Magical Days ~The Brats's Parade~" (VG) (Japanese)
Walker Yumasaki in "Durarara!! 3way standoff" (VG/PSP) (Japanese)
White in "Granblue Fantasy" (VG) (Japanese)
Will in "Kuro Kishi to Shiro no Maou" (VG) (Japanese)
Yanagi in "Wakidenai ~Ichi no Maki: Yanagi~" (Drama CD) (Japanese)
Yoshiie Ukita in "Shinobi, Koi Utsutsu -Setsugekka Koi Emaki-" (VG) (Japanese)
Yuiga Kakeru in "NORN9" (otome VG) (Japanese)
Yuuichi Haga in "Devil Summoner: Soul Hackers" (VG) (Japanese)
Zen in "Persona Q: Shadow of Labyrinth" (VG) (Japanese)
Zhang Fei in "Sangokushi Lovers" (VG) (Japanese) !~

[Instagram](https://Instagram.com/gabriel.martinss/) | [Facebook](https://facebook.com/gabriel.martins.31924792)

Gabriel Martins Oliveira da Costa is a Brazilian actor and voice actor.

__Non-Anime Roles:__
~!- Griffin Gluck (Most of the productions)
- Luke Castellan (Percy Jackson and the Olympians)
- Rubble (Paw Patrol)
- Adam F. Goldberg (2nd voice; The Goldbergs)
- Parker Rooney (Liv and Maddie)
- Richie Rich (Richie Rich 2015)
- Jeremy Birnbaum (Star vs. the Forces of Evil)
- Jack Champion (Avatar: The Way of Water and Scream 6)
- Dae-heon Kim (To All the Boys: Always and Forever and XO, Kitty)
- Young Kakashi Hatake (Naruto X Boruto: Ultimate Ninja Storm Connections)
- Child Vinsmoke Sanji (One Piece Live Action)
- Ethan Morales (Never Have I Ever...)
- Child Nathan "Nate" Drake (Uncharted 4: A Thief's End)
!~

[Twitter](http://www.twitter.com/tommyrojas_) | [Instagram](http://www.instagram.com/tommyrojas_)

A Mexican voice actor.

Nicolás Calderón García is a Mexican voice actor.

__Height:__ 158 cm

[Profile (Aoni)](https://www.aoni.co.jp/search/kuwashima-houko.html) | [Twitter](https://twitter.com/roudokuya_dajai) | [Wiki (en)](https://en.wikipedia.org/wiki/Houko_Kuwashima) | [Wiki (jp)](https://ja.wikipedia.org/wiki/桑島法子)

Houko Kuwashima is a Japanese voice actress and singer. She is capable of playing a variety of roles, ranging from young boys to feminine women. Kuwashima is currently affiliated with Aoni Production. Her first major role was as Yurika Misumaru in Martian Successor Nadesico.

__Non-anime roles:__
- Android 21 - Dragon Ball FighterZ (VG)
- Presea Combatir - Tales of Symphonia (VG)
- Serenica - Dragon Quest XI S: Echoes of an Elusive Age - Definitive Edition (VG)
- Kasumi - Dead or Alive series (VG)
- Roselinde Freya - Shining Blade (VG)
- Mei Ling - Metal Gear Series (VG)
- Jingliu - Honkai: Star Rail (VG)

The second season of B: The Beginning. 
 
When Keith is abducted and a friend from Koku's past resurfaces, Killer B returns and everyone is pulled into a conspiracy involving the crown. 
 
(Source: Netflix)