Personally i voted for Goldar because he was badass in the first part that we saw him. The only thing that made him unable to become more badass was the fact that they wanted to make a joke out of him. Come on losing your memory and becoming Bulk and Skull's lackey? Lame. He was able to fend off the rangers himself. He fought the megazord and yes he got beat up abit of times but he kept coming for more. He was able to stand toe to toe with tommy and their hatred towards each other was great. He also had a wife and a son so he was a family man aswell. Also he looked the coolest when he got his wings back(for which i shall recite "If i have wings why do i walk everywhere.")

Ecliptor. Total badass and just listen to his voice.