Hiroaki Hirata plays as Vinsmoke Sanji (voice) in B: The Beginning.
Hiroaki Hirata is the top #1 member of the cast and appears in 1050 episodes.

Kaito Ishikawa is a Japanese voice actor from Tokyo. He is affiliated with Stay Luck (previously with Pro-Fit).

Kaito Ishikawa plays as Tobio Kageyama (voice) in B: The Beginning.
Kaito Ishikawa is the top #2 member of the cast and appears in 85 episodes.

Kazuya Nakai (中井 和哉, born November 25, 1967) is an award-winning Japanese voice actor and narrator who was born in Kobe, Japan. From a young age, he was interested in anime. Growing up he had interests like volleyball and archery. He was working as a civil servant in a technical field at 25 when he decided that's not how he wanted to live his life, so he enrolled into a voice acting school he attended on his days off and on weekends while still working. Despite starting his career as a narrator, he took off as a voice actor and became a big name when he got the role of Roronoa Zoro, a character he definitely wanted to voice. He narrates programs including information and news programs and voices many iconic characters such as Roronoa Zoro from One Piece, Toshiro Hijikata from Gintama, Date Masamune from Sengoku Basara, Mugen from Samurai Champloo and Jin Sakai in the Japanese dub of the video game Ghost of Tsushima. He loves driving, practicing archery and spending time with his dog and cat.

Kazuya Nakai plays as Akitaru Obi (voice) in B: The Beginning.
Kazuya Nakai is the top #3 member of the cast and appears in 48 episodes.

Yuki Kaji is a Japanese voice actor and singer affiliated with the agency VIMS. He has also been a radio host and acted on stage, and since 2015 has also occasionally been cast in on-screen roles in television dramas. He has voiced many notable roles such as Eren Yeager in Attack on Titan, Issei Hyodo in High School DxD, Shu Ouma in Guilty Crown, Alibaba in Magi: The Labyrinth of Magic, Kazuya Ichinose and Akio Fudou in Inazuma Eleven: Orion no Kokuin, Clemont in Pokémon XY, Meliodas and Zeldris in The Seven Deadly Sins, Yukine in Noragami, Speed-O'Sound Sonic in One-Punch Man, Kanato Sakamaki in Diabolik Lovers, Todoroki Shōto in My Hero Academia, Kozume Kenma in Haikyu!!, Koichi Hirose in JoJo's Bizarre Adventure.

Yuki Kaji plays as Koichi Hirose (voice) in B: The Beginning.
Yuki Kaji is the top #4 member of the cast and appears in 39 episodes.

Asami Seto is a Japanese voice actress affiliated with Sigma Seven. She made her debut in the television anime Hourou Musuko.

Asami Seto plays as Nobara Kugisaki (voice) in B: The Beginning.
Asami Seto is the top #5 member of the cast and appears in 24 episodes.

Toshiyuki Morikawa is a Japanese voice actor. He was formerly affiliated with Arts Vision until he co-founded his own talent agency Axl One in 2011. Because of his deep voice, he is often cast as imposing characters.

Toshiyuki Morikawa plays as Paul Greyrat (voice) in B: The Beginning.
Toshiyuki Morikawa is the top #6 member of the cast and appears in 23 episodes.

Toshiyuki Toyonaga plays as Brandon Brian (voice) in B: The Beginning.
Toshiyuki Toyonaga is the top #7 member of the cast and appears in 12 episodes.

​From Wikipedia, the free encyclopedia Johnny Yong Bosch (born January 6, 1976, Kansas City, Missouri) is an American actor, voice actor, martial artist, and musician. He may be best-known for portraying Lelouch Lamperouge in Code Geass: Lelouch of the Rebellion, Adam Park in Mighty Morphin Power Rangers, and being the English voice of Ichigo Kurosaki in the hit anime series Bleach and Vash the Stampede in Trigun. He is also a two time American Anime Award nominee. He also voiced in the English Dub Anime TV shows including Sailor Moon 1992-1997 as Artemis in the Viz Media redubbed English version and in Doraemon 2005 TV series as Noby. Description above from the Wikipedia article Johnny Yong Bosch, licensed under CC-BY-SA, full list of contributors on Wikipedia.

Johnny Yong Bosch plays as Minatsuki (voice) in B: The Beginning.
Johnny Yong Bosch is the top #8 member of the cast and appears in 12 episodes.

Ami Koshimizu (小清水 亜美, Koshimizu Ami, February 15, 1986) is a Japanese singer, voice actress and stage actress affiliated with Office Restart. She was previously represented by Production Baobab and Axl One.

Ami Koshimizu plays as Amanda (voice) in B: The Beginning.
Ami Koshimizu is the top #9 member of the cast and appears in 12 episodes.

Satomi Sato is a Japanese voice actress and singer affiliated with Aoni Production.

Satomi Sato plays as Yuna (voice) in B: The Beginning.
Satomi Sato is the top #10 member of the cast and appears in 12 episodes.