Reina Koseki (小関麗奈 Koseki Reina?) is one of the characters available in THE iDOLM@STER: Cinderella Girls. Her basic card is Normal. She received three Rare card sets, a Rare+ card, and four S Rare card sets with the titles "School Devil", "Royal Joker", "Magical Girl Flame", "Mischievous☆Queen", and "Marching☆Loudly".
|Event||Prelim Rank||Final Rank|
|1st Anniversary Election||Unranked||Unranked|
|2nd Anniversary Election||Unranked||Unranked|
|3rd Anniversary Election||Unranked||Unranked|
|Voice Idol Audition||Unranked||Unranked|
|4th Anniversary Election||Unranked||Unranked|
|5th Anniversary Election||Unranked||Unranked|
|6th Anniversary Election||Unranked||Unranked|
"さぁ行くわよ、○○! レイナサマがナンバー1アイドルになる手伝いをできるなんて、アンタ運が良いわ。後世まで語り継ぎなさい。愚民共がアタシの前にひれ伏す日が楽しみね! アーッハッハッ…ゲホゲホ"
Reina is a foul-natured girl who condescends over others. She is a prankster and backstabber, and rarely shows regret for it. She is the closest person to being "evil" among the Cinderella Girls characters, although this really means she's just a bit more confrontational than the typical idol. With her boast of "I am the Queen of Evil!", she enjoys watching others getting pranked or laughing at their misfortune. She tends to do things for seemingly no reason other than that she enjoys being spiteful. She carries a megaphone everywhere, and always wears a hateful scowl.
Despite her attitude, she avoids pranking idols younger than her and does not intentionally prank anyone to cause physical harm or property damage. Because of this, it's surmised that a lot of her behavior is due to lacking social skills and wanting attention. She has to be coerced into apologizing for her behavior, and never seems to get into serious trouble when caught. She is depicted as having only one or two friends, namely being Sachiko Koshimizu or Hikaru Nanjo.
In the tie in Cinderella Girls Theater skits, Reina is quick to bully and antagonize her fellow idols. She constantly plans ways to hurt the other idols, ranging from simply laughing at others mistakes to launching bazookas at a room full of girls. Some of her bullying attempts include teasing Riina Tada for wearing a cute costume, speeding up Sana Miyoshi’s running machine, scaring Koharu Koga while jump roping, and shooting Yoshino Yorita in the face with a water gun while she was trying to concentrate.
Reina is easily angered and embarrassed, especially if her plans fail. She was tricked by Azuki Momoi into wearing a cute costume and vowed that she would never do it again. Chinatsu Aikawa also forced her to learn that she shouldn’t do things to others if she isn’t willing to take them herself. Reina earned a role in Chika Yokoyama’s magical girl TV show as the Magical Maiden. She is training partners with Sana Miyoshi and Koharu Koga. Reina also discovered Tsubaki Egami’s photo taking abilities, and attempts to bribe her into using her photos for blackmail.
"Starry Sky Bright" Reina in THE iDOLM@STER Cinderella Girls: Starlight Stage
"Across The Stars" Reina in THE iDOLM@STER Cinderella Girls: Starlight Stage
"Party Time Gold" Reina in THE iDOLM@STER Cinderella Girls: Starlight Stage