He started off with a buster cannon like X and then you add a beam sword and you get an awesome character. Though truth is, he's better off with a sword than a gun however I feel that a sword beats a gun anyday.
Zero is without a doubt one of my favorite characters from the series next to X, his best friend and partner. As we all know, Zero is a surprisingly good fighter and to some degree, an even better fighter than X. He was originally created by Dr. Wily to serve as a final retaliation against Megaman. But on the contrary, he ends up doing the opposite. Because of the fact that Zero has a more badass sort of persona, he has won my overall admiration and respect. And also, due to his fatherlike personality towards X along with the fact that he has died and came back to life more than once, I tend to see a bit of Optimus Prime in him. For this reason, I had often givin him nicknames when I was little; often calling him "Zerodimus Prime" for his overall awesomeness.