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Ryōko Mendō (面堂 了子, Mendou Ryouko?) is the younger sister of Shūtarō Mendō.


Like her older brother, Ryōko is a very attractive and well-mannered girl, but she is actually a sadistic person. She dislikes boredom who is always acting in a half-joking manner. She is a 2nd Year at Seiran High School for Girls. She loves to torment the people she likes, such as her brother and Tobimaro Mizunokōji, with pranks and by creating bad situations for them. When she first appears, she had spent 2 days traveling by ox cart to deliver Shūtarō's forgotten (and now spoiled) bentō, and she will frequently go through such lengths simply to harass him. She also likes to take advantage of Ataru Moroboshi's flirtatious behavior, usually causing a riotous scene in the process.

She is almost always accompanied by her loyal Kuroko who carry out her every order with great skill, in stark contrast to Shūtarō's mostly incompetent Black Glasses Corps. They will set her bombs and traps for her and transport her, either with a kago or by two of them wearing a horse costume for her to ride. They do not only serve Ryōko though, as they are seen carrying out jobs in stories that only feature Shūtarō.

She will throw grenades and bombs at people while acting calm and composed, and yet will cry over them when they return to her charred to a crisp. She often acts in total secrecy without telling anyone of her plans, such as setting bombs in the giant Christmas Cake, turning the giant Christmas Tree into a firework, and retaliating to people by setting off bombs near them.

She also shows an interest in black magic, having used hypnosis and voodoo dolls to torment her brother. She also likes to collect rare and mysterious items. She possesses a sakura tree that she treats like a pet, feeding it sake and the legs of Shūtarō's pet octopi.


Ryōko is a beautiful girl with thigh-length brown hair that is always tied in the back by different colored bows with square bangs covering her forehead and brown eyes.


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Shūtarō Mendō

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Tobimaro Mizunokōji

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Ataru Moroboshi

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  • Her seiyū would also voice Maris from Maris the Chōjo (a short story by Rumiko Takahashi adapted into an OVA).
  • A character of Ranma ½, Kodachi Kuno is very similar to Ryōko. Both are rich, have annoying older brothers, long hair, and can act proper and sophisticated while also possessing a sadistic, murderous streak.
  • Ryōko makes a cameo in episode 4 of Creamy Mami as one of the top ten performers on television. She is number five on the list and her song is titled Loves Masquerade.

Media Appearances


  • Chapters 121-122
  • Chapter 123
  • Chapter 135 (138 in wideban)
  • Chapter 141
  • Chapter 163
  • Chapter 175
  • Chapter 178-179
    • Chapter 178
  • Chapter 182
  • Chapter 196
  • Chapters 202-203
  • Chapter 213
  • Chapters 224-227 (222-225 in wideban)
    • Chapter 224 (222 in wideban)
    • Chapter 227 (225 in wideban)
  • Chapter 232
  • Chapter 244
  • Chapters 252-256 (255-259 in wideban)
  • Chapter 274
  • Chapter 275
  • Chapters 309-310
  • Chapter 321
  • Chapter 327
  • Chapters 329-333 (331-335 in wideban)
    • Chapter 332 (334 in wideban)
  • Chapter 336
  • Chapter 352