Well, I got this from the Anime News Network so you can look at more info there. The movie official website is also here if you want to look for yourself!
Shin
Yukinojo
Taiga
Kakeru
Minato
Leo
Yu
Louis
Alexander
Jin
Shin Ichijō (CV: Junta Terashima), a boy who enrolls at Edel Rose because he wants to become a Prism Star like Hiro Hayami. He is a genuine boy with a shining disposition and is always cheerful and optimistic.
Yukinojō Tachibana (CV: Sōma Saitō), a princess of the kabuki world. He pushes against his parents' extreme opposition and enrolls at Edel Rose. He hides in the world of Prism Star activities, but he suffers inside a personal shell that won't be torn away.
Taiga Kōgami (CV: Tasuku Hatanaka), a street-style breakdancer who enrolls after admiring Kazuki. He's a tough guy who behaves badly. He can't control himself when he reaches out to girls and they reject him.
Kakeru Jūōin (CV: Taku Yashiro), a boy whose real name is Kazuo Jūōin. He is the super-rich heir to the Jūōin conglomerate. His only interest is getting girls' attention. He only enrolls at Edel Rose because he wants to be popular. His true nature is that of an otaku.
Minato Takahashi (CV: Masashi Igarashi), a boy whose heart has a love for peace as big as the huge Pacific Ocean. His sole reason for being is to be like a big brother to everyone and listen to their troubles. He is put in charge of cooking for the dorm when Kōji is initiated.
Leo Saionji (CV: Takuma Nagatsuka), a little sister-type boy who looks like a girl. He always adores the gentle Yukinojō as a big brother and mentor. He enrolls at Edel Rose because he wants to become manly someday.
Yū Suzuno (CV: Yūma Uchida), the younger brother of Happy Rain member Ito Suzuno. The clearheaded boy decides to enroll because he is worried about Edel Rose. He is a tsundere who feigns coolness but yields to his older sister.
Louis Kisaragi (CV: Shouta Aoi), a mysterious, pretty boy. He conducts Shin in the Prism Show.
Alexander Yamato (CV: Shunsuke Takeuchi), a Prism Show destroyer and street tyrant. He's a first-year in high school.
Jin Norizuki (CV: Shinichiro Miki), the leader of Schwarz Rose. He uses Louis and Alexander for his own schemes.
I'm looking forward to the movie, but it's too bad that I don't live in Japan. I'm going to have to wait for the DVD to come out.