Sensei's Brother

Sensei's brother acted as a major influence in Sensei's life up until his death in the car accident. Growing up, Sensei Prime constantly felt inferior to his brother's greater confidence and maturity. Sensei also had feelings for his brother's wife, which made his brother angry. These feelings may have been a contributing factor is Sensei's eventual romantic relationship with his brother's daughter, Maya.

Within Kumon-mi
Inside the simulated world of Kumon-mi, Sensei's brother is presented as Ami's father. In order to better mesh mesh the altered history of this world, the rest of the details of his life are kept the same