Joy Mech Fight (Famicom, 1993)

This is a pretty interesting one. It's a 1-on-1 fighter, and surprisingly good for a Famicom/NES game. You start off as a couple of scientists who have built one robot to enter a tournament. As you defeat each one, the scientists basically steal the robots parts and re-program it to join your side. Eventually you'll have 8 robots to choose from.

Each one has 4 special moves and some hidden, un-listed ones. There's a practice mode in-game that shows you how to do the special moves for each character and lets you test them out, which is pretty advanced for a Famicom/NES game. This was one of the last games made for the system, since the Super Famicom/SNES had come out a few years earlier. Because of that it's basically a way to show off what the system is capable of, and apparently was made completely by two dudes who met at a Nintendo programming seminar, and had completed it by the time it was over. Daaamnnn son, makin' moves. Like, fighting moves? Like making them up? It would probably be okay if you murdered me.