Jango was pretty freakin' awesome. He had cool armor, he was a bounty hunter, he had a jetpack and an awesome ship. He tried to assassinate people (ie padme), but was smart enough (and overcame his emotions enough) to kill Zam Wessel because she almost sang like a bird to the Jedi. Not to mention he is the "father" of Boba Fett, another awesome Mando bounty hunter. I think it was ironic that he liked killing Jedi, and 1 Jedi killed him, but eventually his millions of clones ended up killing most Jedi. We get to see into his life a little more than Maul or Grievous, he seems like an intelligent person, and he isn't trying to be "bad" for the heck of it, he's actually driven by his want for money, and he lets himself be cloned so he can have something of a family. He is, IMO the coolest prequel character. Once again though, they kill him off within a single movie. But he has my vote.