J.M. Barrie, Peter Pan
Tinker Bell is a fairy who lives on the mystical island of Neverland.
She is Peter's fairy companion. She wanted to kill Wendy out of jealousy, and tricked the Lost Boys into shooting Wendy.
She later redeemed herself by saving Peter's life, by drinking up the poisoned medicine Peter was about to drink. Peter rescued her by calling on all of the children who believe in fairies to clap their hands.
Tinker Bell is stated to be so tiny she only has room for one emotion at a time. This later causes her to try and kill Wendy, as jealousy is the only emotion she feels at the time.
She finds it annoying how clueless Peter is when it comes to the emotions of girls, regularly calling him a "Silly Ass" (censored in later additions of the story).
She is willing to risk her life for Peter, drinking his medicine when she knew it was poisoned in order to stop Peter from drinking it when he ignored her warnings. She is shown to have quite a temper, easily being angered.