Because you like Rayne in BloodRayne
Sydney Bristow is a kick-ass double agent on a mission for revenge. See them in Alias.
With an A.I. as loyal and witty as Cortana, who needs humans? See them in Halo.
Marv is a brutish but principled thug who'd be right at home on an ancient battlefield. See them in Sin City.
Xena's a warrior on a redemptive quest who excels in extreme sports and uses a whip to block axes in mid-air. See them in Xena Warrior Princess.
Meat Boy tenaciously throws himself into danger, and when he fails, he immediately gets back up and tries again. See them in Super Meat Boy.
Tifa Lockhart is part mother hen, part martial arts bad-ass. See them in Final Fantasy Series.
Dr. Gordon Freeman is a brilliant physicist is a quiet hero. And given all the violent aliens, he better be. See them in Half-Life.
Wei Shen is an undercover cop on a mission for justice (or at least vengeance). See them in Sleeping Dogs.
Driven by guilt and rage, Kratos is less a man and more an unstoppable avatar of anger and hate. See them in God of War.
Fox McCloud leads a team of pilots through the Lylat System in search of the evil genius Andross, the villain that killed his father. See them in Star Fox.
A jealous woman is dangerous. A jealous assassin woman like Elle Driver is even more so. See them in Kill Bill vol. 1.
Boomerang is equally skilled at tossing boomerangs and tossing back beers. See them in DC Extended Universe.