Zenko

Zenko is the younger sister of Metal Bat.

Appearance
Zenko is a young girl with similar facial features to her older brother. She wears a light colored cardigan & frock, and black flats & high socks with frills. At a point she wore Christan's leather jacket till she returned it later. She has shiny black hair in a Showa era hair style which she keeps around chin-length and clips aside with a floral clip.

Personality
Zenko is just as strong-willed and headstrong as her brother but dislikes violence. She is caring and very protective of her brother and Christan. In addition, she is quite fearless as she was willing to go into an evacuated city during a monster crisis and was not afraid to stand up to Garou and was yelled at and attacked Tanya when she was crushing Christan. Like her brother, she is very hot-headed, to the point of even arguing with Garou despite risking both her and her brother's lives. She even is able to get Christan to do anything she says due to her strong-willed and headstrong attitude. However, she is also quite humble, refusing to boast about her hero brother in front of other school kids.

Abilities and Powers
Despite being a seemingly average human girl, she possesses a few skills that no normal girl at her age would have.

Physical Abilities
Enhanced Speed and Reflexes: Zenko is surprisingly fast, as she was able to intervene between Garou and Metal Bat before they were able to clash again.

Enhanced Leap: She is capable of jumping fairly high for a child, as shown when she jumped to reach her brother's head in order to hit him.

Enhanced Strength: Zenko can easily hold a flower bouquet that is almost as big as her brother with one arm. She was also able to (accidentally) knock Metal Bat out when he was injured.

Miscellaneous Abilities
Expert Pianist: According to her older brother Bad, Zenko plays the piano. She also appears to be quite skilled at it, as she got 3rd place in a piano concert she participated in.

Trivia

 * "Zenko" (ゼンコ, Zenko) means expressive, diplomatic, and refined in nature. Zenko demonstrates these traits when she tries to negotiate a resolution with Garou.
 * In the 2017 One Punch Man Halloween cover, Zenko was depicted as a Japanese one-horned Oni. Zenko eating a yellow onigiri is a reference to the word Oni in onigiri.