The official website for King of Prism: Shiny Seven Stars movies has announced minor characters and TV broadcast information. The cast members announced are young and family members of Yukinojou and Taiga, which will appear in the first movie as well as second and third episodes of the TV series. The anime, which the four-part movies are scheduled to premiere on Japanese theaters on March 2, March 23, April 13 and May 4, will air on Tuesdays at 1:35 a.m. via TV Tokyo, TV Aichi, TV Osaka, and BS TV Tokyo starting April 9. The first broadcast will have a special show introducing the series on the first week of broadcast.

Cast
5 year-old Yukinojou: Ryoko Shiraishi (Hayate no Gotoku! series)
Kikuemon (Father): Kouichi Yamadera (Evangelion series)
Shiko (Mother): Aya Hisakawa (Bishoujo Senshi Sailor Moon series)
Yukiokina (Grandfather): Mugihito (Binan Koukou Chikyuu Boueibu LOVE! series)

Young Taiga: Mutsumi Tamura (Digimon Adventure tri. movies)
Oozora (Sister): Nozomi Yamamoto (The iDOLM@STER Cinderella Girls series)
Saeka (Mother): Mariko Munakata (Dive!!)
Koudai (Father): Hidenori Takahashi (Uta no☆Prince-sama♪ series)


Source: Moca News


Update: March 7
The official website for King of Prism: Shiny Seven Stars movies has announced more characters, who are young Kakeru, as well as people related to Kakeru, George, and Minato. They will appear in the second movie as well as fourth, fifth, and sixth episodes of the TV series.

Merina: Yoshiki Murakami (Binan Koukou Chikyuu Boueibu LOVE! LOVE! series)
Sen Juunouji (Mother): Urara Takano (Fate/Extra: Last Encore)
Mantarou Juunouji (Grandfather): Shigeru Chiba (Yuu☆Yuu☆Hakusho series)
Kyou Juunouji (Grandmother): Yoko Soumi (Ajin)
Kodama Senior Managing Director: Junpei Morita (Hero Mask)
Livingstone: Kenji Nomura (Cyborg 009: Call of Justice movie trilogy)
Kazuo Juunouji (6 Years Old): You Taichi (Urawa no Usagi-chan)

Miyo Tsuyama: Azusa Satou (Hagane Orchestra)

Kai Takahashi (Mother): Mabuki Andou (Seirei no Moribito)
You Takahashi (Father): Mitsuaki Hoshino (The iDOLM@STER series)
Tsubasa Takahashi (Younger Sister): Yoshino Nanjo (Senki Zesshou Symphogear series)
Shio Takahashi (Younger Brother): Chihiro Ikki (Boruto: Naruto Next Generations)
Nagisa Takahashi (Younger Sister): Koko Hayashi (Kiratto Pri☆chan)
Namisuke Igarashi (Grandfather): Chafurin (Detective Conan series)
Funako Igarashi (Grandmother): Yorie Terauchi (Sazae-san)


Source: Moca News