Reki Tatemae

Reki Tatemae (建前零姫), real name currently unknown, is a major character in Kamen Rider Nio. An early benefactor of Era Saga with a freely-admitted shady past, she runs a motorcycle repair shop in Raoi and is responsible for the maintenance of the Mashinceptor and eventually the other Rider Machines.

As his unofficial guardian for many years, Era refers to her as Teacher (師匠), a moniker which is quickly taken up by other characters.