The mercenary and the private club president

Deathstroke the Terminator-Sebastian Shaw

If the first character cited above, one who’s occasionally been played as an anti-hero, had been characterized more as a “good guy” in recent years, he would have been paired with Wolverine, no questions asked. He was portrayed as more or less beneficent in a solo series in the anti-hero happy early ‘90s.

But Deathstroke the Terminator (the second component of the DC character’s name hasn’t been referenced in funnee books, despite having debuted in 1980, a full four years before the Ah-note film) has been placed firmly in the “bad guy” column for awhile, and as such has been established as a major villain in the entire DCU.

So he’ll be paired with the unambiguously evil mutant leader of a New York private club bent on world domination: y’know, where you can play squash, watch CNBC, and then try to subvert the free world.

Commonalities:
Both are cultured, upper class but very ruthless antagonists.

Differences:
Apart from their differing but similar abilities, Wilson is a man of honor completely unlike the morally destitute Shaw.

Alternate histories:

DT: Aristocrat Slade Wilson is born with the ability to use 90% of his brain, and as such becomes an incredibly formidable combatant and strategist. Wilson becomes the leader of an elite club with the goal of world domination, and is opposed consistently by the Teen Titans.

SS: Soldier Sebastian Shaw is experimented on by military scientists, granting him the ability to absorb kinetic energy and transform it into raw strength. Shaw becomes a mercenary, and becomes estranged from his family. Shaw eventually opposes the X-Men, and enlists the young superhuman Rogue in his efforts to defeat the team. For a number of years, Shaw works alongside the X-Men, but has more recently turned against that organization and has since antagonized other superhuman operatives.