Funniest character:
Probably Yesung in They Walk Among Us.  More or less?

Smartest character:
This is definitely Kyuhyun in It Begins With Blood

Stupidest/silliest character:
Hmm... likely Joon in the first part of They Walk Among Us

Kindest character:
Lay from Demon in the Woods (then again Lay almost always comes to mind for this one  >.>)

Most pessimistic character:
Probably Kyuhyun in Loss of Order

Most memorable character:
Goodness, they're all memorable.  O.o  Hah!  Zico in Unveiling the Assassin.  For a small role, he's hard to forget.  ;)  Beggar Co for the win!

Most loved character (either by other characters/readers):
Character wise, probably Jongup in Daehyun: Valkyr of the Gods.

Most hated character (either by other characters/readers):
This would have to be Gackt from Through the Ages if we're talking characters  lol

Most realistic character:
Tough call.  Probably Donghae in Jaded Eyes.

Most unique/strange character:
Hah!  That is so Rorona in Through the Ages, but she's also a character from a game so otherwise... Dara in Daehyun: Valkyr of the Gods.

Scene stealer(not main character but steal the limelight):
Key (in like everything  lol) but he does well in Unveiling the Assassin

Character/Pairing that deserve different ending/fate:
OnKey in Always There  T_T

Characters from different fics that should be crosspaired into a fic:
Hmm...  This one's hard!  -_-  Because I like this pairing (though I haven't written them yet, Jiyong from Through the Ages and CL from More Than Meets the Eye).

The character you'd love to have around in your life for real:
Realistically speaking, Yongguk in Warped Affection.  If we're talking fantasy, Onew in They Walk Among Us (or Leeteuk  >.>)

Easiest Character to Write:
Despite the fact that they're not main characters I fall back on, it's probably a toss up between Heechul, Key, Jiyong, and Zico (I know that's a lot.  Hush.  lol)

Hardest Character To Write:
Erm... Minho in Through the Ages?  *shrug*  haha

*Seriously.  These are fun but... hard!  lol