Gai Tsutsugami

Gai Tsutsugami is one of villains of Guilty Crown is he is one of the main protagonists of the first half of the series but he was later revealed as the main antagonist as revived along with Mana Ouma

Childhood
Gai was orphaned when his parents passed away and discovered by Shuichiro Keido used him as experiments along with boys for Apocalypse Virus which engagges Gai to escaped from facility and falling in the sea before he was discovered by Mana Ouma and her younger brother Shu who nursed him for his health and become best friends, Gai fall in love with Mana and Gai discovered that Mana was infected by Apocalypse virus which caused her insanity