Kotal Kahn - Love him. IMO he fits MK like a glove. Also loving that he's more neutral then evil. I get a little sick of Outworlder's always being evil, just because they're in Outworld.
D'vorah - Love her. When I picture new characters, I picture characters like this. I love the non-human characters who are part of their own race (Reptile, Baraka, Goro). I just hope D'vorah isn't the last of her kind. IMO Reptile should be the only one who's the last of his people.
Ferr/Torr - Love them! Seriously, these are hands down my favorite of the new characters so far. I'v always liked the bigger hulk like characters. One thing I never liked about them though was the "big dumb attitude". But with Ferra, I feel like I can put that worry to rest. It won't matter how stupid Torr is, because Ferra is the personality of the character. And so far, I love her.
Erron Black - Love him. I have a feeling this will be one of the most popular of the new characters, next to Kotal. He seems like a pretty badass dude, and I love the name. I don't really care for the guns though. Hopefully they're implemented in a way that makes sense in Mortal Kombat.
Cassie Cage - She's probably my least favorite. I still really like her, but she doesn't interest me all that much. I like her personality, and her Johnny like attitude. I just don't care for her moveset. Or her face. That face looks goofy to me.
Takeda - I don't really have much to say about this character. He's definitely a good character, I just don't see anything about him that sticks out to me. I guess his whip like weapons are pretty cool.
Kung Jin - Love him. He fits into Mortal Kombat very nicely. And that bow looks like it's the bee's knee's in kombat. I just almost wish he wasn't related to Kung Lao. It feels very forced IMO. I know it's a nitpick, but I just wish he was his own character. Making him Kung Lao's cousin feels like an afterthought.
Jacqui Briggs - Love her. I don't understand why her affiliation with Jax gets her so much hate. I haven't heard her talk jive, she doesn't have bogus metal arms, and she clearly has a bigger role in the story then Jax has ever had. And that face! I don't even see a hint of man face. She looks very feminine. One little nitpick is the arm guns/flamethrowers. Hopefully she has some supernatural powers of some kind. Otherwise she's walking into Stryker territory.