Sadamitsu the Destroyer

Sadamitsu the Destroyer (破壊魔定光, Hakaima Sadamitsu) is a Japanese manga series by Masahiko Nakahira and serialized by Monthly Ultra Jump from 1999 to 2005. An anime adaptation by Studio Deen was broadcasted by WOWOW from January 17 to March 21, 2001, and was licensed by Media Blasters in the US.

Plot
Sadamitsu Tsubaki, a high-school delinquent puts on a motorcycle-helmet-like mask and becomes a semi-robotic superhero who fights, while not dealing with his rocky relationship with Yayoi Kamishiro. He is assisted by other possibly- mechanical creatures in order to save the earth from the invasion of 20,000,000 escaped alien convicts.