One might argue that Franklin Richards would be the most powerful in a 'Secret Wars DC Marvel fanfic'. He has the ability to create entire universes. This power dwarfs many of the individual strength - based powers of the DC and Marvel heroes. But if we consider raw combat ability, someone like Thor with his godly strength, lightning powers, and combat experience might also be a top candidate, especially when facing off against characters like Aquaman or Green Arrow from DC.
It's hard to say for sure, but many would argue that it could be Superman. His powers are almost limitless - super strength, flight, heat vision, etc. In a crossover, he would be a force to be reckoned with against most Marvel characters. However, characters like Thor with his godly powers and the ability to control lightning could also give Superman a run for his money.
It's hard to say for sure, but many would argue that it could be Superman. His super strength, speed, flight, and heat vision are incredibly powerful. He has been shown to be able to move planets in the DC universe. In a crossover, he could be a dominant force, but he also has weaknesses like kryptonite that could be exploited.
It's really hard to say. Superman has incredible strength, speed, and a whole bunch of other powers. But then you have characters like Darth Sidious who are extremely powerful in the Force. If they were to face off, it would depend on the situation. Maybe in a physical fight, Superman would have the upper hand, but Sidious could use the Force to manipulate and deceive. So it could go either way.
Darth Vader also has a strong claim. His mastery of the Force, along with his combat skills and his leadership in the Galactic Empire, would make him a formidable opponent. If he were to somehow get his hands on some Marvel - style technology or powers, he could become even more powerful. For example, if he were to combine his lightsaber skills with Wolverine's healing factor, he would be nearly unbeatable.
Definitely Superman and Captain America. They both represent the ideals of their respective universes. Superman with his superhuman strength and unwavering moral compass, and Captain America with his leadership and never - give - up attitude. Another interesting pairing would be Batman and Iron Man. They're both brilliant inventors and strategists, and seeing them compete or collaborate on a project would be fascinating.
It's hard to say, but Thor could be a really powerful character in a Halo x Marvel crossover. He has his godly powers, like control over lightning and super strength. In the Halo universe, not many things can stand up to his power. He could easily take on Covenant forces or even some of the Flood with his hammer Mjolnir.
One idea could be that the universes of DC and Marvel collide due to a powerful magical artifact. Heroes and villains from both sides have to team up to stop the destruction of both universes. For example, Superman and Captain America leading their respective groups in a battle against a combined force of Darkseid and Thanos who are trying to use the chaos to gain ultimate power.
The most powerful character in a Star Wars Halo crossover fanfic could be different depending on the situation. If it's a battle of brute strength and combat skills, Master Chief would be up there. But when it comes to the power of the mind and manipulation, characters like Emperor Palpatine have an edge. However, if we consider the potential for growth and the ability to inspire others, a character like Leia Organa could be very powerful. She has leadership skills and is also Force - sensitive, which could be a deadly combination when combined with Halo technology or allies.
It could be Ruby. Her speed semblance gives her an edge in combat, and if she were to master the Force on top of that, she would be extremely powerful. She has the determination and leadership skills that could make her a force to be reckoned with in both the RWBY and Star Wars universes combined.
It could be Naruto. His ability to harness and control large amounts of chakra is already very powerful. If he were to also gain the ability to use the Force, he would be nearly unstoppable. He could use his Sage Mode along with the Force to sense danger from afar and attack with great force.