Ah, Cooler. Another one of my personal favorites. He is ALMOST as cool as Frieza. He is the first to discover a transformation beyond a third, and a very powerful fighter to boot. He does a good job at wreaking havoc on the z warriors with his henchmen, but finds himself no match for Goku as a super saiyan. He made his mistake through a big ego though(like Frieza), he could've destroyed Goku, when his pod was fleeing from Vegeta before it blew up, but he let him go, and met his end at the hands of the saiyan roughly 23 years later.