Takehito Koyasu is a Japanese voice actor. Koyasu is part of the voice actor quartet Weiß consisting of Weiß Kreuz voice castmates Shinichiro Miki, Tomokazu Seki, and Hiro Yūki. He used to work for Production Baobab but is now the head of T's Factory, a voice actor company he founded in 1998. Koyasu is known for his deep, smooth voice, which often lands him in roles that are either villains or lonely bishōnen. Recently, though (as in the cases of Mitsurugi Hanagata from Saber Marionette J, Ryo Kuroyanagi from Yakitate!! Japan, Bobobo-bo Bo-bobo, and Kei Itoshiki from (Zoku) Sayonara, Zetsubou-Sensei) he has been voicing more and more lively/humorous characters. According to Hisaya Nakajo, the manga artist of the series Hana-Kimi, the character of Masao Himejima was designed with Koyasu's voice in mind; the voice actor ended up voicing this character in the series' drama CDs. On 18 September 2009, he created Velvet Underworld series which is the first drama CD of the series, "The Fool". In the following month, "The Wheel of Fortune" had released as the second drama CD of the series.

Takehito Koyasu plays as Dio Brando (voice), DIO (voice) in The Greatest Demon Lord Is Reborn as a Typical Nobody.
Takehito Koyasu is the top #1 member of the cast and appears in 74 episodes.

Kenta Miyake is a Japanese voice actor affiliated with 81 Produce.

Kenta Miyake plays as Muhammad Avdol (voice) in The Greatest Demon Lord Is Reborn as a Typical Nobody.
Kenta Miyake is the top #2 member of the cast and appears in 48 episodes.

Yui Ogura is a Japanese voice actress and singer.  She is a member of the duo YuiKaori and a former member of the groups StylipS and Happy! Style Rookies. Not to be confused with Yui Ogura (小倉 結衣), an eroge voice actress.

Yui Ogura plays as Kyouka (voice) in The Greatest Demon Lord Is Reborn as a Typical Nobody.
Yui Ogura is the top #3 member of the cast and appears in 13 episodes.

Ayaka Ohashi is a Japanese voice actress and singer.

Ayaka Ohashi plays as Hatsune (voice) in The Greatest Demon Lord Is Reborn as a Typical Nobody.
Ayaka Ohashi is the top #4 member of the cast and appears in 13 episodes.

Rie Takahashi plays as Ninym Ralei (voice) in The Greatest Demon Lord Is Reborn as a Typical Nobody.
Rie Takahashi is the top #5 member of the cast and appears in 12 episodes.

Kaida Yuki is a voice actress (seiyuu) and radio personality from Tokyo, Japan. Although she has an extensive vocal range, voicing a large variety of characters throughout her career, she is commonly typecasted as young males, achieving mainstream success as her roles in Hunter × Hunter as Kurapika, The Prince of Tennis as Shusuke Fuji, and Shounen Onmyouji as Abe no Masahiro. She was formerly affiliated with the talent management agency Toritori Office, but is currently freelance. She holds the distinction of being one of the only Japanese voice actors to have completed their formal education in the United States. Consequently, she speaks multiple languages with varying degrees of fluency outside of Japanese. She is affectionately nicknamed Yukki (ゆっきー) by her Japanese fans.

Kaida Yuki plays as Kohaku (voice) in The Greatest Demon Lord Is Reborn as a Typical Nobody.
Kaida Yuki is the top #6 member of the cast and appears in 12 episodes.

Mie Sonozaki (園崎 未恵, Sonozaki Mie, February 7, 1973) is a Japanese voice actress, actress and singer from Tokyo. She is free and has a business alliance with Re-max. She used to have the stage name in hiragana (そのざき みえ, Sonozaki Mie) before changing to her real name on April 1, 2002.

Mie Sonozaki plays as Olivia vel Vine (voice) in The Greatest Demon Lord Is Reborn as a Typical Nobody.
Mie Sonozaki is the top #7 member of the cast and appears in 10 episodes.

Kohei Amasaki plays as Valvatos (voice) in The Greatest Demon Lord Is Reborn as a Typical Nobody.
Kohei Amasaki is the top #8 member of the cast and appears in 10 episodes.

Toshinari Fukamachi is a voice actor born on August 29 in Yamagata Prefecture, Japan. He is currently affiliated with Apte Pro.

Toshinari Fukamachi plays as Ard Meteor (voice) in The Greatest Demon Lord Is Reborn as a Typical Nobody.
Toshinari Fukamachi is the top #9 member of the cast and appears in 10 episodes.

Wakana Maruoka plays as Ireena Litz de Olhyde (voice) in The Greatest Demon Lord Is Reborn as a Typical Nobody.
Wakana Maruoka is the top #10 member of the cast and appears in 10 episodes.