Umeko has red eyes, and maroon hair to her ears. She tends to use the same suit, even in summer, because she needs to carried her whip in her suit. She has white skin.

Umeko Kojima is the homeroom teacher of class 2-F. She uses a whip to punish the students who don't pay attention in class. Her studens called her Ume-sensei or Oni-Kojima when she's not around.

She is single and has never had a boyfriend since she's dedicated her life to her studies and later to her career. She is very perceptive of other people when they talk about her age.

She is descended from a family of warriors and has been trained ever since she was little. She practices the Kojima whip style and uses her breaks to train herself with the whip to ensure her students aren't more powerful than her.

In addition, like most of the teachers in Kawakami Academy, she was also a student in Kawakami Temple.

Her parents keep making marriage arrangements for her. This troubles her, but she does fear that she'll never get married since most of her friends of her age are already married.

Kyojin Usami has a crush on her, but she can't even stand him. She says they could never be together because he is not her type, but she has admitted she does appreciate his affection despite not liking him.

She has a Sub Route in the original Majikoi visual novel.

Umeko is serious, firm and strict when she teaches. But is fair and kind in her own way, giving support to her students when necessary, in paticular to Yamato Naoe.

Umeko has hinted that she likes younger, intelligent men and may have a slight crush on Yamato. This is shown in her Sub Route and in Miyako's Route when she blushed after Yamato started to cheer with his friends to see her in her swimsuit.

She is a master of the whip and can use the Kojima whip style with deadly efficiency in a serious fight, being able to defeat enemies in less than a minute. She can deflect attacks and defeat multiple opponents. In Yukie's Route, during the KOS tournament, she defeated 20 opponents using one technique.

(Source: Majikoi Wiki)