She is the friend of Mirakurun when she isn't transformed yet rival when she is.
Raika has long sky blue hair and wears glasses while her counterpart Rivarun is taller with darker blue hair and sharper eyes. Both have amber eyes.
Raika wears a simple sailor uniform, with a turtleneck and tights.
As a magical girl, Riviarun's costume is a high exposure black bikini top, paired with purple gypsy pants that match her scarf and witch hat.
Normally, Rivarun is a school girl named Raika who is best friends with Mirakurun's counterpart Kurumi and she quite helpful often assisting her friend with homework or running errands for her like buying yakisoda bread. There are also hilarious bits such as when she is forced to do Mirakurun's homework while attempting to fight her.
Riviarun is Mirkurun's rival and a member of the Giga Giga Group along with Ganbō, her boss. She has an aim to conquer the world, though it does seem that she actually does care for her rival. It is shown when she defeats Mirkurun and she starts tearing up at the end of Mirakurun. It questions whether or not she is an ally or an enemy.
|Amusement Club||Akari Akaza • Kyōko Toshinō • Yui Funami • Chinatsu Yoshikawa|
|Student Council||Ayano Sugiura • Chitose Ikeda • Sakurako Ōmuro • Himawari Furutani • Rise Matsumoto|
|Teachers||Nana Nishigaki • Hatsumi Kitamiya • Shihoko Azuma • Tsubasa Minamino|
|Relatives||Akane Akaza • Tomoko Yoshikawa • Chizuru Ikeda • Mari Funami • Kaede Furutani • Nadeshiko Ōmuro • Hanako Ōmuro|
|Majokko Mirakurun||Mirakurun/Kurumi • Rivarun/Raika • Ganbō|
|Minor characters||Haruka Koyama • Takane Dezaki • Hiro Takaoka • Aoi Isurugi • Megumi Sonokawa • Ai Miwa • Miho Yaeno|