Selina Kyle (aka Catwoman) is one of DC's most important antiheroes. She's primarily known for her complex relationship with Batman, in which they have gone from enemies to lovers in record time. The Dark Knight can't seem to resist Catwoman, even if she's essentially a criminal burglar. This would also likely be true for many Marvel heroes.
Catwoman is a fascinating character. She enjoys the thrill of thievery but also believes in justice, even if her concept of the ideal is completely different from that of Batman. Catwoman follows her gut when it comes to morality, and figures like She-Hulk, Star-Lord, and Wolverine would surely appreciate this if they were ever to meet.
10 Black Widow
When Natalia Romanova was only a kid, the Russian government took away her life and turned her into a biologically enhanced spy for the nation. Given this, Black Widow knows justice isn't always possible through the official channels. Given this, she would love Catwoman's modus operendi.
Selina only steals from the rich, particularly those whom she identifies as corrupt. By doing this, she punishes them, even when the system won't. Black Widow and Catwoman would likely become close friends if they ever had a discussion about systemic injustice.
9 Daredevil
Since Matt "Daredevil" Murdock works to enforce justice both in his day and night job, it may be hard to believe that he would like Catwoman at all. However, Matt gained an understanding of inequality at a young age, which means he knows morality is often a matter of circumstances.
The Man Without Fear would likely criticize Catwoman's actions. However, he would also be attracted to her complex antiheroic nature. As a lawyer and a vigilante, Matt Murdock has spent quite a bit of time reflecting on morals, and Catwoman would surely challenge his ideals making for an interesting but complex relationship between the two.
8 Mystique
Mystique and Catwoman are incredibly similar. They're both smart, strong women, who operate in morally ambiguous areas. Mystique used to be a more villainous character, but she has changed ever since, going for a more anti-heroic vibe. Given this, she would highly respect Catwoman's moral alignment.
Of course, this doesn't mean Mystique would become Catwoman's ally. Raven is known for being less than loyal to her teammates, so their friendship would probably only last until Mystique pledges allegiance to others, possibly backstabbing Catwoman.
7 Wolverine
Considering Wolverine’s morals, he may not love the idea of Catwoman acting as a cat burglar. However, he would surely find Selina’s antiheroics attractive. After all, Wolverine believes in justice by one’s own hand and the distribution of violence when necessary.
Additionally, Wolverine appreciates ruthlessness. Catwoman will likely never stop delivering her brand of justice to those who deserve it, and that would definitely win her the mutant's respect. They could also bond over the fact that they are both animal-themed heroes.
6 Molly Hayes
The youngest member of the Runaways, Molly Hayes is known for her superhuman strength and her impressionable attitude. Molly does her best to be a superhero alongside her Runaways teammates, but she's still a kid, so the others have to guide her so she doesn't end up doing wrong.
Molly would absolutely love Selina Kyle if they ever met, first because of her cat-themed costume and second, because she has a strong sense of social justice. The young girl would likely see Catwoman as a role model, which might actually create problems with her older (and protective) teammates.
5 Star-Lord
Currently, Star-Lord is considered one of Marvel's most influential heroes. However, before becoming one of the galaxy's saviors, he was a space pirate. Prior to joining the Guardians of the Galaxy, he was a thief searching for treasure, and he has always been proud of his pilfering skills.
Considering his past, Star-Lord would love to have a chat with Catwoman and maybe observe her as she showcases her own skills. Peter Quill and Selina Kyle would definitely bond over their abilities at the risk of being judged by others.
4 Iron Man
Selina Kyle is in a complex love-hate relationship with a genius billionaire crime-fighter in Batman. Interestingly enough, if she was a Marvel character, she could easily be in another one with Iron Man. The playboy Avenger has had his fair share of romances and Catwoman would love to play with him in a game of cat and mouse.
Tony Star isn't broody like Batman. Instead, he has turned into quite a charismatic character, especially after his portrayal in the MCU. This would allow for a very flirtatious relationship with Selina. Tony would probably be intrigued by her mysterious attitude and charmed by her wit to the point that he would ignore her crimes.
3 Hellcat
Patsy Walker aka Hellcat debuted in Marvel in 1944 as the main character of a teen-oriented romance comedy. However, she later became a cat-themed superhero and a prominent member of the Defenders. Patsy is a law-abiding superhero, but she's also friends with antiheroes like Nighthawk and Black Cat.
Since Hellcat is comfortable hanging out with those who operate outside the law, she would have no problem with Catwoman. Not only they could bond over their cat-themed personas, but they also share incredible fighting skills and feline physical prowess.
2 Prowler
Aaron Davis (also known as Prowler) is the uncle of Miles Morales and is also one of his enemies. He's a cat burglar who trades stolen material from obtained from laboratories, such as weapons. Prowler puts confidential weaponry in the hands of street-level criminals, which makes him a very serious threat.
Prowler would love Selina's craft. As a thief himself, he would respect Catwoman's methods and her feline stealth, as well as the fact that she enjoys working outside the law. They would probably bond over their hate for corrupt rich groups and the lack of social justice in the world.
1 Black Cat
Black Cat is one of Marvel's best antiheroes and is essentially Catwoman's Marvel counterpart. Both Selina Kyle and Felicia Hardy are cat-themed cat burglars in black who have a complicated relationship with a renowned hero: Batman and Spider-Man respectively.
The main difference between these two antiheroines is that Black Cat has the ability to affect probability fields while Catwoman has no superpowers. Regardless, they would likely get along immediately because of their commonalities. Black Cat would surely love the similarities between herself and Catwoman, and they would surely trade tips on effective theivery.