K' is a fictional character from The King of Fighters series, first introduced as a mysterious and stoic fighter with amnesia. He possesses pyrokinetic abilities gained through experimentation and fights using a mix of rapid punches, kicks, and fire-based attacks. K' serves as a central protagonist in the NESTS storyline, where he struggles to uncover his past and oppose the organization that created him. He is often portrayed as cold, aloof, and reluctant, but he gradually builds bonds with allies like Maxima and Whip.