Hayato Jin

"“I am just a teacher. I don't make the rules here.” —Hayato" Hayato Jin (神 隼人) is a supporting character who first appeared in the anime The Hows of Me and Liliana, as the homeroom teacher of Tatsuya Nagare, Nozomu Sunohara and Shiori Takanashi. He was the veteran pilot of the Getter Robo, before changing his name to Hayato Kamiya (神谷 隼人) to live in an anonymous civilian life.

Tatsuya Nagare
Tatsuya is one of Hayato's students.

The Dinosaur and Hyakki Empires
He apparently has knowledge on the Dinosaur Empire and later the Hyakki Empire. It is later suggested that Hayato had previously encountered them in the past, long before Tatsuya, Liliana, Nozomu and Shiori all did.

Ryoma Nagare
Hayato was once Ryoma Nagare's best friend and most trusted ally. Things got more complicated when he got involved in a love triangle between him, Ryoma and Michiru Saotome.