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 more 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 the Red Tails at her side.

Saint Ishiyama High 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 Horsemen and the Ishiyama Gang.

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

Akumano Academy Arc
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Abilities
As a member of the Red Tails, it can be assured Asuka is a capable fighter on her own. However unlike the other Red Tails 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 Tails
a member of the Red Tails, 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
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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.
 * Comparing her appearances in the anime and manga, Asuka has more appearances in the anime.