Deathstroke the Terminator
Deathstroke, born Slade Wilson, is an elite mercenary, assassin, and scourge of the superhero community. In addition to his extensive military experience and training, Slade was injected with a superserum that enhanced his abilities. Deathstroke specializes in taking down superheroes with his advanced strategic planning skills. With preparation he has been able to singlehandedly defeat the Justice League.
Deathstroke possesses various enhanced abilities, including the strength of ten men and heightened speed, agility, stamina, and reflexes. He has the capacity to use up to 90% of his brain making him a tactical genius, adept at turning opponents' own abilities against them.
It has been shown recently that the serum in fact grants a precognitive sense that lets him see into the immediate future. This allows him to react to oncoming attacks a moment before they occur and to counter them accordingly. With his training and reflexes, a moment is a long time. He has even been able to counter speedsters, kneecapping Kid Flash and making the Flash impale himself on his sword.
Deathstroke also has a healing factor in his blood that enables him to heal from physical injury much faster than a normal person; it does have limitations as he could not regenerate a lost eye, and therefore could not regenerate entire limbs. The healing factor enables him to recover from what would otherwise be fatal injuries, though recovering from such injuries renders him insane and animalistic for a short period.
Deathstroke is also skilled in the use of many weapons ranging from guns, rifles, and swords, which are usually among his current weapons of choice. His signature weapon is a power staff that fires lethal and non-lethal energy blasts from both ends. The staff can also be used to strike using energy at each end. His sword and staff are made of promethium, a nearly invulnerable alloy. His body armor is composed of a mesh-woven, kevlar, and promethium chainlink mail, capable of stopping small arms fire.