Mayu Tanaka (田中真由 Tanaka Mayu) was the late daughter of Kai Midō, the wife of Tsutomu Tanaka and the mother of their unborn son Satoshi Tanaka.
Appearance
Mayu was considered a very attractive woman by Tsutomu Tanaka. From the back of her head, she had dark hair in two tied up Chinese buns and was seen wearing a karate Dougi.
Personality
Not much was known of her personality, but she appears to be a kind and polite person but can be a little bossy. Tanaka claims he's "whipped" by her, indicating she was the dominant one in the relationship. Regardless, it's proven she loves her husband very much.
Mayu clearly showed a strong devotion and love towards her father, which seemed to be her downfall, as after seeing Kensei murder him, she flew into rage and attempted to avenge him. This reveals that a degree of immaturity at allowing her emotions to get the better of her and attempt challenge someone she had no hope of defeating in battle.
Skills
Mayu was an extremely gifted individual as even the Elder said she was fairly talented to be a young master in martial arts. Her progress has unfortunately stopped when she died trying to avenge her father.
It's important to note while she had the skill and talent to be considered a master, she still lacked the maturity of one. This is seen in how she allowed her anger to cloud her judgment and foolishly attempt to kill Ogata, an extremely lethal Grand Master who has succeed in killing Mayu's own master, thus it was highly unlikely she could defeat him.