Black Cat has a long history in Marvel of being one of its best thieves. She also has a long history of being super into Spider-Man as well as being conflicted as to whether she's a hero or a villain.
Black Cat kind of just does whatever she wants whenever she feels like it, then lets the rest of the world label her accordingly. The Marvel Universe has come to accept this about Black Cat, but some of the DC villains would probably just make her angry.
10 Would Hate: Lex Luthor
It's safe to say that pretty much no one in DC likes Lex Luthor, not that he particularly cares. There's no reason to believe that Black Cat would feel any different. Lex is highly intelligent, normally putting his mind to use in finding ways to destroy Superman and take over the world.
He rarely forms legitimate alliances with anyone and normally throws his teammates to the wolves once he's done with them. Luthor would try to do the same to Black Cat, something she would not appreciate.
9 Team Up With: Captain Boomerang
While you can say a lot of truly terrible things about Captain Boomerang, he at least has somewhat of a sense of honor when it comes to working with other rogues. Primarily known as a Flash villain, he's fought a variety of heroes at different times. He knows the value of a good team-up.
Captain Boomerang is someone Black Cat would be happy to work with as he would appreciate her skills and probably help her with a few jobs. For a cut, of course.
8 Would Hate: Rose Wilson
Like her father, Deathstroke, Rose Wilson is extremely intelligent and an impressive fighter. Rose has enhanced strength, speed, agility, and durability, all of which allow her to perform incredible moves in combat. More importantly, she is highly intelligent, so much so that she can examine all available data in a moment and essentially predict the future.
Rose is as unlikely to appreciate someone who makes her living as a thief as Black Cat is to appreciate someone who might kill her on a whim.
7 Team Up With: Cheetah
There have been a few villains over the years who have taken the name Cheetah but no one memorable as Barbara Ann Minerva. She has enhanced, cat-like strength, speed, and agility, enough so that she can effectively challenge Wonder Woman in combat.
In addition to that, Cheetah also has incredibly sharp fans and claws. One story showed them as being sharp enough to pierce even Superman's skin. Black Cat's goals might be different from Cheetah's but there is still plenty of common ground to work with.
6 Would Hate: Vandal Savage
Saying that the immortal former caveman known as Vandal Savage is the biggest condescending, arrogant bag of wind in DC is a big deal when you remember that Lex Luthor lives there, too.
After being enhanced by a meteorite, Savage walked the Earth for the next 50,000 years, constantly trying to figure out ways to take over the world, the same thing he does every day. Black Cat would undoubtedly hate him, but Savage would also have a lot of valuable stuff worth stealing.
5 Team Up With: King Shark
First appearing in the early 1990s when Superboy made his way to Hawaii, King Shark might actually be King of the Sharks. He is apparently the son of the Shark God, and that feels like it would give him a good shot at the title.
King Shark is quite literally a large, anthropomorphic shark that seems to like getting into fights and biting people. His power would come in handy for Black Cat, though King Shark would make a terrible thief. He is a shark, after all.
4 Would Hate: Harley Quinn
Right off the bat, it's worth noting that this only applies to Harley Quinn back in her villainous days alongside Joker. The current, more heroic version of Harley would probably get along quite well with Black Cat.
Old school Harley, not so much. That version of Harley was only interested in the chaos, death, and making Mr. J happy. Black Cat would have had little or no time for that as she's not generally interested in harming innocent people for giggles.
3 Team Up With: Killer Frost
The current iteration of Killer Frost has gone on an incredible journey, one that led her from being a villain to joining the Suicide Squad and finally becoming a member of the Justice League. It's a path of redemption that few villains get to go on.
But in her villainous days, she was essentially a heat vampire who needed to drain the heat from other human bodies to survive. Black Cat wouldn't be a fan of that but she would be a fan of a teaming up with someone who has such incredible cold-related powers.
2 Would Hate: Ra's al Ghul
"The Demon's Head" serves two roles in Batman's life. First and foremost, he is Batman's greatest nemesis, no matter what Joker tries to tell you. Secondly, he is the grandfather to Batman's son, Damian Wayne.
Relationships with in-laws can be rough but this takes the cake. While Ra's loves a good assassin, he's not as appreciative of straight-up thieves. He and Black Cat would not get along well, right off the bat.
1 Team Up With: Talia al Ghul
As the daughter of Ra's al Ghul, Talia has seen a lot of terrible things and been trained to beat them all. Sometimes she is ready to rule the world like her father. Other times, she seems more interested in stopping him, though that may just be for her own benefit.
Ultimately, it would come down to what's best for her and Damian. If anyone understands that internal struggle, as well as what it's like to be in love with a hero, it's Black Cat.