Nemesis: Martian Manhunter
Other Major Foes: Batman
Appearances: 4 comics.
Powers: Presumably possesses all the abilities and weaknesses inherent in the Martian race, but displayed none in print. He instead relied upon his sword, ray pistol, and the use of an armed space shuttle.
Bio: N'or Cott was the commander of the Martian Army in exile after the destruction of their home world. He plotted with R'es Eda to frame J'onn J'onzz for murder to prevent the hero's opposition to a massacre that would allow the surviving Martians to take over an alien city. N'or Cott made numerous attempts on the lives of the Martian Manhunter and his fellow heroes before succumbing to exposure from the city's poisonous atmosphere.
Win: R'es Eda (6-4)
Lose: Human Squirrel (4-6); Martian Criminal (?)
Deathstroke the Terminator
Nemesis: So many choices. His entire family, for starters.
Other Major Foes: The Justice League, The Titans (all divisions,) the Outsiders
Appearances: 600+ comics, live action television, animation, and video games.
Powers: Superhuman expert combatant with increased strength, speed, reflexes, agility, stamina, and senses. Wilson has a healing factor that increases his lifespan and makes him virtually impossible to kill short of decapitation. He's also very rich and well armed.
Bio: Slade Wilson, by his own reckoning, is "a goddam killing machine!" Volunteering for a U.S. Army experiment, Wilson's already exceptional combat prowess was enhanced to an extraordinary level, making him essentially an evil Captain America with greater powers. Wilson used these gifts to amass a considerable fortune as a mercenary. This took a toll on his family, rendering one son mute and another deceased. The Terminator vowed to follow through on his dead son's last assignment, capturing the New Teen Titans for a criminal organization. Thus began a path that saw Deathstroke in constant conflict with heroes and villains alike, including seeing his ex-wife, daughter, and surviving son (though Slade did kill the boy once, it didn't take) become enemies sworn to his destruction. If Wilson wasn't so accomplished an adversary, the sheer number of his foes would have overwhelmed him by now.
Fun fact- "Norcott" is an Old English habitational surname derived from "North" and "cottage," or "shelter." N'or Cott's goal was to take over Baltaz so his people could find a home on a harsh new world. N'or Cott himself is likely going to need shelter from the Terminator. Cott brought a sword to a fistfight with J'onn J'onzz and still managed to lose while being assisted by several of his men. In fact, Cott repeatedly tried to kill an unarmed Martian Manhunter with high explosives and consistently failed. While weakened by toxic exposure, N'or Cott also sucker punched Batman, but failed to actually knock him out. Meanwhile, Deathstroke once took out Aquaman, the Flash and Green Lantern by turns in a single comic and had the spare time to demolish a team of X-Force analogues before getting captured by Superman. Slade Wilson has beaten the hell out of the Batman and his protégé Nightwing on numerous occasions, and he's a single combatant created to take on whole super-teams like the New Teen Titans. Martian or not, N'or Cott's going to die again...