manic pixie dream girl

noun1

1. •
   A stock female character, typically characterized as a bubbly, quirky free spirit, whose main purpose within a narrative is to teach a young male protagonist to embrace the mysteries and adventures of life.

   • But even as Gina's behavior dips past manic pixie dream girl to merely manic, the director never deviates from the detached tone of his prologue. — 2017