Kuro-chan

クロちゃん

The strongest, most violent cyborg cat. He was once an ordinary cat until he got involved in an accident. He was then turned into a cyborg by Dr. Go, who wanted him to stay with him under his command. However, Kuro rebelled and took down some of the doctor's minions.
He created a rivalry with Mi-kun, who taught him how to use a longsword.
Eventually, in the middle of the series, he became comrades with Mi-kun. Later on, Kuro defeats Dr. Go and becomes friends with him.
Despite his scary and violent attitude, he still shows signs of kindness to someone, which includes the two old geezers who took care of him and Nana, a cyborg created by Kotaro, who fell in love with him. He may be pissed whenever she is around, but he still cares for and worries about her, and probably fell in love with her too.
Kuro-chan can use a long-range gatling, a revolving gun, a longsword, and his most ultimate form is the Hyper Berserker Kuro (Shin Bousou Kuro-chan).
Kuro-chan makes cameo appearances in the Robot Poncots manga and video game series. The Medarot S: Unlimited Nova mobile game has a collaboration event with Medarots based on Kuro-chan, Mi-kun, Matatabi, Dr. Go, and Neko Danger.