His unconventional character an eccentricities were described in "Warera ga fukyo no shi" (Our Wacky Teacher), by Koji AOYAMA, one of Doi's former students at the Third High School; in it, Doi was described under the pseudonym "Kazuma TOKI," but all other proper names used, except for the names of his family members, were real names.
またその奇人・奇行ぶりは、三高での教え子だった青山光二の、『われらが風狂の師』に、土岐数馬として、しかし、家族の名前以外の固有名はそのままに描かれている。