Anyone but Bo Rai Cho and Shujinko. I use Jade, Kabal, and Ermac the most though.

Sub Zero is my primary character as he's always been a favourite of mine and I am quite good with him. I also enjoy using Ermac and Noob-Smoke.

My primary fighter is Raiden. Always has been, since MK1.
After that I would have to say Noob-Smoke. I like the tricky aspect of the tag team, as well as all the teleportation. They should have given them some more original moves though...they only have 3. The shurikens, the smokey-cuy, and the stinky-cloud. All other moves are held by another character. Noob's charging punch with Smoke? That's just a variant of Kobra's kick. The disabler Noob used to have was cheap(well, that's what everyone says when they get smacked with it)...but at least it was original.
Finally I would have to settle on Liu Kang. Normally I do not like him, but his styles for this game are really good,and I find him fun to play with now.

I usually use Sub-Zero. He's been my only constant from the original.
However, I've taken to Ermac lately.

Kenshi is my best fighter. He can dish out a serious whooping from a distance and at close range. He's a very balanced fighter and hard to read if he's being played right. I usually don't have trouble beating anyone with him. My alternate choice in character is NigthWolf and that's only when someone Cheeses me. I never lose with Nightwolf.

Kenshi is my best fighter. He can dish out a serious whooping from a distance and at close range. He's a very balanced fighter and hard to read if he's being played right. I usually don't have trouble beating anyone with him. My alternate choice in character is NigthWolf and that's only when someone Cheeses me. I never lose with Nightwolf.

(In order of useage, where 1 is the most..)
1. Kabal: HOOKSWORDS!!11
2. Baraka: Who doesn't like Baraka? So simple, yet effective..
3. Li Mei: Her weapon is very good..
4. Liu Kang: Uber cheese!!
5. Noob-Smoke: still learning them.. it seems that most people don't have much trouble with them anymore.
6. Sub-Zero: I like to mix up his special moves with his Kori attacks.
7. Ermac: Just started with him; I like his juggling abilities..
8. Havik: I used to use him a lot more, but got a bit tired of him. He's still very effective against most opponents, though.
9. Scorpion: Chosen if I'm just playing around against someone I know I'm better than / vers'ing someone who picks Scorpion EVERY TIME
10. Shujinko: Same as #9.

I whoop ass with Baraka....I am also quite good with raiden too.

Alright! This game is awesome guys, I've only played it for 9 hours and it rocks in face-to-face with a friend! So, after a full day conclusion I'm voting:
1. Shujinko and Sub-Zero: I wipe anyone's ass with theese two. Shujinko is a mean machine, gets anyone mixed up. Sub-Zero is pretty good at combo attacks.
2. Scorpion and Havik: to put it simple: both of them rock!
3. Bo Rai Cho: except for his Sumo, I still have my skills with him. Wish Mi Zong was back tough.

scorpion alll the way he is the best

The characters that I'm the best with are Tanya, Li Mei, and Kobra, so I use them the most. I'll also use ( and am pretty good with) Ermac, Havik, Mileena, Kira, and Shujinko.

Tanya
Ermac
Ashrah
Hotaru
Jade
Nightwolf

Right now it's Kabal. I seem to do the best with him. I never use his specials outside the plasma ball to harass people that try to run and play firball catch. I also use Sub-Zero because he was just the first character I learned how to use and was good with him for a while until I found out how really crappy he is against top tier characters. It seems like Boon wants Sub-Zero to lose and Scorpion to win. Kinda sucks for Sub-Zero fans. I also use Mileens because she has very good pop-ups for playing mind games and I know her Fatality pretty much by heart. I used to use Noob-Smoke, but since his moves are so easy to get around I don't pick him so much. Yeah, mostly just Kabal for the pokes and quick combos from the hooksword stance.