Good call with
囧, actually a lot of people use this one in chat as an emoticon, since it looks like a sad face with a mouth. i.e.
I'd have to throw in my vote for..
一 Which scholars may recognize as the character for "one", a mathematical concept first invented by the Chinese in 600 B.C. It's a beast to write but I still find it beautiful despite the complexities.
二 and 三 come in a close 2nd and third.
For those of you who used Dragon, oh my God that is so typical, well guess what I see your dragon and I'll raise you two more. That's right, THREE FUCKING DRAGONS. (and mine are red)
龘