Black Widow might be a dark horse in terms of competitiveness. She's a master of strategy and manipulation. She'd quietly observe the other players, figure out their weaknesses, and then use that knowledge to her advantage. She might not be as showy as Iron Man or Loki, but she'd be just as determined to win.
It's hard to say for sure, but Thor could be a very powerful character. His hammer gives him the ability to fly and strike with great force. Against the Titans, he could use his lightning powers to fry them. Also, his god - like strength and durability would make him a tough opponent for the Titans.
I think Jack - Jack would be really interesting. His unpredictable and ever - changing powers could bring a lot of chaos and fun to the story. He could be the wildcard that the Avengers don't quite know how to handle at first. Maybe he accidentally turns into something that causes a big problem, like a giant monster, but then uses his powers in a creative way to help solve it later.
Doctor Strange is also a very powerful character. With his mastery of the mystic arts, he can create portals, manipulate time, and shield himself and others from attacks. In a battle against the Suicide Squad, his powers would be very difficult for them to counter. He could even trap some of the more dangerous members in other dimensions. And when it comes to the Avengers, he has proven to be a valuable asset in many battles.
I think Spider - Man from the Avengers and Four Arms from Ben 10 would make an interesting combination. They both have enhanced strength and agility. They could have some really cool fight scenes together, and also some humorous exchanges. Four Arms' brute strength combined with Spider - Man's acrobatics would be a sight to see.
Black Widow. She has a lot in common with Batman in terms of skills. Both are highly trained in combat, stealth, and espionage. They would understand each other's need for secrecy and their ability to operate in the shadows.
Hulk. He has a tendency to lose control and his large size could easily knock over shelves or accidentally break items.
I think Thor and Groot would be an interesting pair. Thor is this powerful Asgardian with his hammer (or axe) and Groot is this gentle but strong plant - like being. They could have some really fun exchanges, like Thor trying to teach Groot some Asgardian sayings and Groot just responding with 'I am Groot' in his own cute way.
I think Iron Man and the Flash would get along well. Iron Man is always interested in new technology and the Flash's super - speed abilities are like a form of amazing technology. They could have long discussions about how the Flash's powers work and Iron Man might even try to create something inspired by it.
Black Widow and Nebula would make for an interesting pair too. Both are strong female characters who have had a rough past. They could bond over their experiences of being in the shadow of more powerful male figures in their respective groups. And they could also team up to take on some of the more dangerous enemies, using their stealth and combat skills.
It's hard to say. Thor has his godly powers and his hammer Mjolnir which gives him great strength. But in the 'Attack on Titan' world, Eren's Titan form is also extremely powerful. However, if we consider all - around power, Iron Man with his advanced technology and ability to constantly upgrade his suit might be the most powerful. He could analyze the Titans' weaknesses and come up with strategies to take them down.