Gwen Stacy was Captain Stacy's daughter and Spider-Man's original love interest before Mary Jane came around. the Green Goblin, who knew Peter's secret identity, kidnapped Gwen and dropped her out of a bridge, and despite Spider-Man's web reaching her before she hit the ground, the shock made her pass away. The loss of Gwen was one of the biggest tragedies in Spider-Man's career.
Her only abilities are to be able to kick and punch, however, in LEGO Marvel Super Heroes 2 she can fight martial arts style with some drumsticks, she also has an explosive attack using her battery.
In Spiderman 3, she is portrayed by Bryce Dallas Howard, who also portrayed Claire Dearing in Jurassic World.