Other Major Foes: Superman, Martian Manhunter
Appearances: 25+ comics
Powers: Fire control and teleportation.
Aubrey Sparks was a redneck transformed by Emperor Joker into a hard living devil girl. Her mental instability caused her to clash with various heroes until she struck up a bargain with J'Onn J'Onzz to fix her mind if she fixed his weakness against fire. Both were temporarily successful, until the ancient Martian id monster Fernus cooked her brain.
Win: S'vor (9-6); Bel Juz (7-4*); Human Flame (9-4); Effigy
Lose: Bette Noir (7-8*) Saturnian Criminal (4-5)
*Denotes multi-participant match, rather that a duel.
Other Major Foes: Justice League of America
Appearances: 125+ comics, animation, video games and toys.
Powers: Cryokinesis and heat absorption.
Scientist Louise Lincoln inherited the role and powers of Killer Frost from her deceased friend and colleague Crystal Frost, with whom she had the common bond of being murderous nutters. Frost has plagued many heroes of the DC Universe, but holds special enmity against the Nuclear Man.
Elemental confrontations are visual spectacles, but I burned Scorch with this match. Killer Frost's powers are fueled by heat, and since that's about the only weapon in Scorch's arsenal, Frost will simply gorge and chill.