Ahsoka Tano: I've heard all the complaints "She's just in the show to bring girls in", "She was never mentioned in any of the movies". To the first complaint...so?, it's working and to the second one just simple math explains it. Revenge of The Sith came out in 2005 and The Clone Wars came out in 2008, so they just hadn't thought of the character yet. She plays a huge role in the character development of Anakin. The Jedi code forbids attachment, and Anakin is attached to Ahsoka. Attachment is what leads to Anakin's downfall. The character of Ahsoka adds to Anakin's character and makes his fall some much harder to experience. In the show we see Anakin as a hero, a mentor not a dark brooding person but a good person and we see that because of Ahsoka. It makes Anakin's fall to the darkside that much more tragic. The original triology had it's big 3 of Han, Luke, and Leia and now the Clone Wars has it big 3 of Obi-Wan, Anakin and Ahsoka.
Cad Bane: One of the best parts of StarWars is the "fringe" element, bounty hunters, smugglers, pirates, gamblers. Some of them say their about the credits and only look out for themselves but really turn out to be one of the good guys, like Han Solo and some really are about the money and themselves....That's Cad Bane. Cold, ruthless, and lots of fun.
Ziro the Hutt: C'mon...he's a big purple Hutt that talks like Truman Capote. He's a likable flamboyant bad guy what more can you say? He's too funny and odd not to like.
Honda Ohnaka: He's a pirate, another member of the fringe. He's not evil...but not a total good guy either. He managed to capture both Count Dooku and Obi-Wan and Anakin and then try to hold them all hostage. He's always plotting and has his hustle going, plus he's likable. The main heroes don't really seem to be worried or annoyed when he pops up, it's like they know it will be a fun time too!
Savage Opress: Dude....look at him, it's awesome. He's Darth Maul's brother. Take everything awesome about Darth Maul and throw in some Darth Vader and you have Savage. He offered himself to be taken by the Nigh Sisters to protect his brother and after they work their magic on him.....he kills his brother. He was created as a weapon of terror and revenge. He's all brute force and destruction. The Savage Opress story arc was great StarWars and Savage is a great villain. No one rushes to face him, everyone runs from him and now he's out looking for his other brother....Darth Maul!
Honorable mention....Pre Visla.
Ok, there it is my favs. Come back next week for.....I don't know yet