Who? ... ::cue soft sweet music::
Blossom is the lead Powerpuff Girl, one of three super hero sisters, 'Saving the world before bedtime'. They live in a small city called Townsville, and can be seen daily on any of the cartoon network channels.
"Of the the Professor's three Daughters, Blossom is the smartest and brightest. Many of Blossom's superpowers have literally gone to her head: Her impressive intelligence and itellectual curiosity make her a natural leader among her sisters. With a confidence far beyond her years, Blossom never steps down and always speaks her mind. Despite her studious nature, Blossom has no problem cutting loose for a little hopscotch or the occasional super-powered game of tag."
Quote from official PPG movie site.