The anime production team for I’m the Villainess, So I’m Taming the Final Boss has revealed additional voice cast members for the show, as well as the opening theme song artist. The series is scheduled to air this coming October 2022.
The new voice cast members include Yuuma Uchida as Isaac Lombard, Hiroki Yasumoto as Jasper Varie, Takuto Yoshinaga as Doni, Shinichirou Kamio as Ruck, and Yuu Miyazaki as Quartz. They join main cast members Rie Takahashi as the main heroine Aileen Lauren d’Autriche, Yuuichirou Umehara as Claude Jean Ellmeyer, and Toshiki Masuda as Cedric Jean Ellmeyer.

Takahashi will also be singing the anime’s opening theme song “Kyoukan Sarenakute mo Ii ja Nai.”
🎵\オープニング主題歌情報/🎵#悪ラス のオープニング主題歌は……
— 『悪役令嬢なのでラスボスを飼ってみました』TVアニメ公式 (@akulas_pr) August 18, 2022
アイリーン役の #高橋李依 さんが歌う「共感されなくてもいいじゃない」に決定しました💎
どのような楽曲になったかは、続報をお楽しみに🎼
👇公式HPでは高橋さんのコメントを公開❗️https://t.co/4dOpD0djbo pic.twitter.com/IeWsC1AL1m
Kumiko Habara (I’m Standing on a Million Lives) is directing I’m the Villainess, So I’m Taming the Final Boss and Kenta Ihara (Mieruko-chan) is serving as series screenwriter. Momoko Makiuchi, Eri Kojima (In the Land of Leadale), and Yuuko Ooba (I’m Standing on a Million Lives) are handling the character designs for the anime. MAHO FILM is in charge of the animation production for the anime series.
An all-female team of music composers is providing the score, consisting of Natsumi Tabuchi (Adachi and Shimamura), Hanae Nakamura (My Next Life as a Villainess: All Routes Lead to Doom! X), Miki Sakurai (Machikado Mazoku), Sayaka Aoki (Girlfriend Girlfriend), and Kanade Sakuma (My Next Life as a Villainess: All Routes Lead to Doom! X).
The anime adaptation of I’m the Villainess, So I’m Taming the Final Boss is based on the light novels written by Sarasa Nagase and illustrated by Mai Murasaki, which was first published on September 1, 2022. Nagase first launched the series as a web novel on Shousetsuka ni Narou in May 2017. The series was later picked up by Kadokawa Shoten for their Kadokawa Beans Bunko imprint. Nine light novel volumes have been released so far. The series has also inspired a short manga adaptation.

Both the light novel and manga have been licensed in English by Yen Press. They describe the series’ synopsis as:
Villains Have Their Own Routes Too!
When her engagement to the prince ends unceremoniously, details of the young noblewoman Aileen’s past life come rushing back and help her realize she’s living inside the world of one of her favorite otome games—as the heroine’s greatest rival! However, her memory has more plot holes than bad fan fiction…and the only certainty is that if she doesn’t do something quick, her death is all but assured. The hero/main-love-interest can’t be relied on, so why not see what the last boss has to say?
Source: I’m the Villainess, So I’m Taming the Final Boss Official Twitter