Headcanon
Riddler built himself a robot cat when he first began dabbling in robotics and artificial intelligence. He lacked a few crucial parts, however, so instead of purring, the cat made a hideous grinding noise. There was also a bug in the programming he never quite got around to ironing out that caused the cat to randomly meow and purr simultaneously, then just fall to the floor. He named it Glitch, and ultimately kept it around for about a year and a half before a lightning storm fried it on its charging station one night.

















