Kuro

Black is a character only shown in the To Love Ru manga series. He is a hitman who seems to know Golden Darkness on the battlefield. He bares a resemblence to Train Heartnet from the manga Black Cat another series by Kentaro Yabuki, also his name Black represents Train's nickname "Black Cat".

Background
The only background information that we know is that he has fought Golden Darkness in the past, but we do not know who won the battle. He is also the main character in the series Black Cat, where his friend,  Everesembles Yami-chan in both apearance and abilities. Also he seems to be very moody, hardly showing any emotions.

Black was the one who destroyed the organization that created Yami, setting her free.

Powers and Abilities
Black is a master gunman, using his guns to accurately shoot and kill his opponents. He also seems to be very fast, as he can be in one place, and then be at another place at in a second. A black cat always appears before he does. If this cat is his pet or companion for battle has not been revealed.