Masao Kirishima

Masao Kirishima (桐島 牧生) is the main antagonist of Mars. Masao is a sociopath who is in love with Rei, and as such wishes to kill Kira. He wants Rei to return to the way he was before he met Kira, going as far as to stab him when he realizes Rei won't change. Rei saved Masao a few years prior to the series.