I have a three-way tie. Dairou/Ashrah/Hotaru.

Hotaru or Havik

Dairou, Awesome weapon and I really want to know more about him.
Darrius, His weapons are AWESOOOMME
Kobra, I like his awesome moves
Havik, Most well thought out "mutant" character in MK history.
They all seem so badass, I hope they turn out to be better new characters than the list for MKDA turned out. Kenshi and Li Mei are the only two that will make it in the MK unizerse.

Darrius, finnally a black guy in mortal kombat who promises to be GOOD! I HATE YOU JAX!!!!

Hotaru, possibly Dairou.

Havik and Darrius.

Hotaru, Ashrah, & Havik! (specially Hotaru!).

This is actually a toughy. I really like Havik's look. I don't know how he'll play yet. I like Hotaru's pop-up special and his look. Kobra seems like he might be a kick ass character because of his specials. I was interested in Kira until I found out she had Sonya and Kano's moves. Dairou might be a good character. I'm not digging Darius' look. Reminds me too much of Morpheus or something. I have to see more of Ashrah. I'm not digging her look right now. Damn this is tough. I think I am most excited about Havik and Shujinko. Shujinko could be a very sick character, seeing as how he'll have moves from everyone else. That could make for some very twisted combo's!
So yeah, Havik and Hotaru. Sorry this is so long. It's not that easy since I have seen enough of all of the new characters.

Ashrah and Hotaru
Ashrah ha ha Hotaru poo poo

kobra,hotaru

Hotaru and Kobra...

Hotaru...he looks the best so far from any other character.

Jade
Kira
Liu Kang
Shujinko
Baraka
Nightwolf

i would have to say darrius and hotaru. more darrius thought cuz that foo looks kool!

Kira
Ben Kobra
Ashrah

Ashrah
Kobra
and Darrius