Yumi Yamamoto (山本 由美 Yamamoto Yumi), also known as Yuumin, is the former Queen of Karuta who is considered to be the best karuta player from Suihoku Society and she is a Grade 6 karuta player.
Yumi is a thin woman with short brown hair tied in a pony-tail and brown eyes. She has admitted herself that she has a plain appearance.
She wears her hair without a ponytail when at work.
Yumi is known for contesting every close-call during matches and being very tenacious. Nikuman-kun pointed out during her match with Chihaya Ayase that despite that, her karuta is very accurate and fast.
She has not gotten over her defeat by Shinobu Wakamiya and tends to be pessimistic. She has little self-confidence and doesn't like the pressure of competition.
After losing her title to Shinobu Wakamiya, Yumi has lost her confidence and motivation when it comes to karuta. However, the match against Chihaya Ayase made her return to her old and stubborn personality.
Yumi's posture which is something that is perfected over years and her calluses in hands and feet are evidences of how she worked hard in playing karuta. Her swing is compact and measured and her body also knows how far each card is.
Her karuta style is said to be persistent and stubborn. She also has the experience since karuta is all she had since she was a child. By playing hundreds of matches, she knows at which point a match will be determined hence can manage to turn the tables.
She is infamous for her legendary contesting of cards, earning her the nickname "Contest Yuumin." She contests every close call with absolute confidence, and gives detailed explanations of what happened. Because other karuta players have to stop playing while a contest is taking place, most people frown upon this habit. She did not do this as much while she was Queen, but after losing the title this habit returned.
- The name Yumi means "reason, cause" (由) (yu) and "beautiful" (美) (mi).
- People from Suihoku Society call her "Yuumin".
- Yumi's surname Yamamoto means "mountain" (山) (yama) and "base, root, origin" (本) (moto).
- Yumi believes herself to be plain and that she has only karuta.
- Yumi works as a bank teller.