Train Heartnet
トレイン ハートネット
Also known as Black Cat and the main protagonist in the story, he starts as a ruthless assassin but learns compassion from Saya Minatsuki.
His gun was made just for him by Chronos, called Hades. He also has a soft spot for women and children, especially when tears are shed.
After his change of heart (when Creed kills Saya), he works as a sweeper alongside Sven and Eve.