Lucy

Lucy Van Pelt works hard at being bossy, crabby and selfish.
She is loud and yells a lot. Her smiles and motives are rarely pure.
She's a know-it-all who dispenses advice whether you want it or not--
and for Charlie Brown, there's a charge. She's a fussbudget,
in the true sense of the word. She's a real grouch, with only one
or two soft spots, and both of them may be Schroeder, who prefers Beethoven.
As she sees it, hers is the only way. The absence of logic in her arguments
holds a kind of shining lunacy. When it comes to compliments,
Lucy only likes receiving them. If she's paying one--or even smiling--she's
probably up to something devious.

http://www.snoopy.com/comics/peanuts/meet_the_gang/meet_lucy.html