Inugami Kyoushiro

About
Inugami Kyoushiro is an antagonist and somewhat of a rival to Gorou. His role is similar to that of Hikaru Sanjo, but his character is far from it.

He first comes across Gorou as he's trying to be romantic with  Shion whilst watching a movie and interrupts them by being loudly moved to tears. They then picked a fight and went on their ways. To their surprise it turns out they were both mech pilots and on opposing sides.

He's quite the otaku and thus similar to Gorou. He normally tries to exloit any weakness, but with Gorou he seems to push his buttons so he takes him on. He Seemingly wants to test if he's a worthy rival. He loses to Gorou and he throws himself into a volcano only to return as a cyborg, which he finds to be the otaku pinnacle. He later realizes that cyborgs can't really train so he sides with the aliens to remodel him so he can take Gorou on again.

It is later revealed that he's actually the son of Makutsudo Nobuhiko. He was disowned because he tried to sell a treasured doujinshi to some pirates. After reuniting with his father he learns why he lost and what it means to be a true otaku.

Trivia

 * It cost Yukoku Mech Corps $6 million to rebuild him, meaning he's probably valuable to them.
 * He gets his penis replaced by a drill, the ultimate otaku romance according to him.