Mono

Mono is a close friend of Switch and Stereo. Mono is the oldest of the group and is qualified for a Monitor position, but is currently assistant to his father who is a Monitor Supervisor and Mono occasionally does Courier work due to the freer schedule.

While being trained for the governmental positions in Media, Mono has a passion of botany and herbology, and often would visit Stereo and his mother Audio prior to Stereo going rogue. After Stereo's disappearance was when Mono perused becoming a Monitor Assistant and stayed in contact with the family through Signal and Audio. Mono is outgoing, friendly, and often times focus on humor outwardly when in group or public settings and is more serious with his friends in private settings. 

After Unit died and Mono lost contact with Stereo, he and Switch generally travelled together during Mono's courier work and off-time while Switch pursued his studies during destination stops.