Amber:
His lore: He lived with his parents and his 5 siblings before the war. He used to be a hero until one day, his family perished in a fight between the hero's and the villains. He was devastated. He was then manipulated into joining the villains because "they tried to help his family but the heroes didn't let them."
Amber was then sent to a lab where he was forced to train. When he was 16(his current age.), he met Aqua. He hated him at first but when Aqua persuaded him to sneak out with him, he grew feelings for him. But then, something happened.
Aqua:
His lore: Aqua was raised in a villain household who didn't care if he wanted to be a villain or not. They accepted the fact that he wanted to be hero and that was that. When he was 17, he met Amber. It was love at first sight. They became close friends. But one day, Amber was brainwashed by his company, forcing him to kill Aqua. In his last moments, he confessed his love to Amber. "Don't cry, silly. I'll still be here...just...not in this world. So smile for me...show that beautiful smile one last time...I love you so much...haha...I was finally able to say it...I....love....you..."
And then after the war he gets revived :p