Ryōko Asuka

is a blonde member of Red Tail. She always wears a medical mask and rarely talks.

Appearance
Ryoko has long, blonde hair styled in a similar fashion to Shizuka Nanami's, though it is messier and her bangs fall over her right eye, and is always seen wearing a medical mask. She is sometimes seen wearing her school's uniform.

Personality
She has a delinquent-like personality and doesn't hesitate to make daring comments about others. She is usually seen with Yuka Hanazawa.

Tōhōshinki Arc
Her first appearance was during Tatsumi Oga's, Hajime Kanzaki's and Tatsuya Himekawa's assault on Ishiyama to confront Tojo. However, they were blocked by delinquents who were apparently promised to that if they took down the trio they would united under Tojo. Aoi Kunieda intervenes with Red Tail at her side.

Saint Ishiyama Academy Arc
She and Hanazawa are seen eating together in their flashback concerning Takeshi Shiroyama's injury. They blame themselves for what happens and this throws Kanzaki into an uncontrollable rage. She appears as a support character taking the outfit of a cheerleader during the volleyball match between the Six Holy Knights and the Ishiyama Gang.

Prince En Arc
Seen as a supporting character when Yuka Hanazawa asks her to cover for the missing Ishiyama students.

Return to Ishiyama High School Arc
One day, she and the other Red Tail members find Aoi writing fortune cookie messages. Ryōko tells Aoi that they will help her write them.

Ryōko eventually heads back to Ishiyama during the new semester following its second reconstruction. As she hangs out on the rooftop with the other Red Tail girls, she discovers that Yuka evidently has little knowledge about the "Killer Six Elements", exasperating Ryōko. Ryōko later points out to Nene that Yuka still doesn't understand after listening to her explanation.

Later in the afternoon, several of the Red Tail, including Ryōko, head to the Kunieda residence where they see an injured Aoi being tended to her wounds by her grandfather. Ryōko is worried about her former leader and asks whether she is seriously hurt. Aoi explains that she is fine, though the ones who attacked her were from Mahō Academy, apparently led by Ringo Hōjō; upon hearing the name of Aoi's predecessor, an already-anxious Ryōko grows shocked.

A meeting is eventually held outside; among the attendees are the other Red Tail and Tōhōshinki. Ryōko is initially worried about Tōjō's absence; after hearing Natsume's theory, she wonders whether the "Killer Six Elements" have already taken down the "beast". However, her suspicions lower when Jinno confirms that he is perfectly fine. The delinquents' meeting soon commences and, following a series of back-and-forth conversation, they all decide to gather information on their enemies before launching an attack; moreover, a private fight will be held between Yōhei Nasu and Tatsumi Oga. Problems soon arise with Kanzaki's and Himekawa's disapproval of Oga as their leader. When Yuka suggests a game of rock-paper-scissors to solve the issue, Ryōko hesitantly says that she is fine with the idea, subsequently leading to everyone present into participating. The results conclude with Baby Beel being the leader of their alliance.

Powers & Abilities
As a member of Red Tail, it can be assured Asuka is a capable fighter on her own. However unlike the other members of Red Tail she doesn't appear to wield a weapon, but in the later chapters and episodes she is seen holding some kind of badge with Japanese characters on it. On closer inspection the badge has some sort of groove in it, giving it the vague appearance of a yoyo. On one occasion she wields a kendo stick, but not for too long to make it her trademark weapon.

Red Tail
a member of Red Tail, she always supports them.

Yuka Hanazawa
She and Hanazawa appear to be close friends and are often seen together. It it revealed both of them are skilled at hair styling when they offer Tatsuya Himekawa to bring his trademark pompadour down. Yuka also asks her to cover for the missing Ishiyama students while they go searching for Prince En.

Quotes

 * "We ain't gonna let anyone drag Madame Aoi down...": when she and Hanazawa were about to take Himekawa's trademark pompadour down.
 * "Don't say it...": when Hanazawa was about to express her insecurities while bathing with the presence of Hilda

Trivia

 * Asuka has taken her mask off three times. Once when she was eating lunch with Yuka Hanazawa at Saint Ishiyama Academy, the second time in her flashback when Yuka contacted her and asked her to cover for her and the Ishiyama gang, and the third and most recent time while shown during a scene in a public bath.