"A Tank Cat with its feral side unleashed. It is itching for a fight, even though it can't tear wet tissue paper. Its feral side has completely overwhelmed it. Its cost
does not measure up to its improved defenses, nor its low power."
This is a joke character. He has the stats of a meatshield, but an insanely high cost (tied for the highest in the game!), which makes him, by far, the least cost-efficient cat.
Killer tank resembles a Tank Cat with black fur and red eyes, also with white whiskers.