Well, it could be Imperialdramon and Iron Man. Imperialdramon has the ability to fly at high speeds and has powerful energy blasts. Iron Man, with his advanced technology and strategic mind, could enhance Imperialdramon's powers even further. They could work together to outsmart and overpower their enemies. For example, Iron Man could analyze the enemy's weaknesses and direct Imperialdramon's attacks for maximum efficiency.
I think Omnimon and Thor would be a very powerful combination. Omnimon has incredible strength and a wide range of attacks, and when combined with Thor's godly powers and his mighty hammer, they would be almost unstoppable. They could take on the biggest threats both in the Digital World and in the Marvel universe.
Omnimon could also be a very powerful partner for Naruto. Omnimon is a super - powerful Digimon resulting from the fusion of WarGreymon and MetalGarurumon. Naruto's ability to make friends and work in teams would be perfect for handling Omnimon's complex nature. Together, they could take on any enemy in the fanfiction world.
Thor would be a strong contender. His god - like strength and the power of Mjolnir, or Stormbreaker, could be very effective against the Titans. He could fly in and smash the Titans with his hammer, and his lightning powers could also do significant damage.
I think it could also be a character like Itachi. His Sharingan gives him incredible combat abilities such as genjutsu and enhanced perception. If he were to get his hands on Halo technology, he could use it in very strategic ways. For instance, using a cloaking device to enhance his already stealthy nature from his ninja skills. And his intelligence would make him a force to be reckoned with in any 'naruto halo fanfiction' scenario.
Arceus from Pokemon and Omnimon from Digimon are both extremely powerful. Arceus is like a god in the Pokemon world, creating everything. Omnimon is a powerful Digimon formed by the fusion of WarGreymon and MetalGarurumon. If they were in a crossover, it's really hard to say who would be more powerful. It might depend on the situation and how their powers interact.
It could be Kirito. He has a lot of combat experience from SAO. If he teams up with a strong Digimon like Omnimon, he would be extremely powerful. His sword - fighting skills combined with Omnimon's attacks would make them a formidable force in any battle.
Captain Marvel is often considered one of the most powerful Avengers. Her powers include energy absorption and manipulation, flight, and superhuman strength and durability.
Thor is often considered one of the most powerful Avengers in the comics. His godly powers and mighty hammer give him a significant edge.
It could be Naruto. His vast array of ninjutsu, including the Rasengan and the ability to use the Nine - Tails' power, gives him an edge. He has experience in large - scale battles and has faced incredibly powerful foes. His ability to quickly adapt and come up with new strategies would make him a tough opponent against Kengan Ashura characters.
It could be Sailor Moon herself. Her powerful magic and ability to transform could give her an edge. She has the power of the Silver Crystal which is extremely potent. When combined with the powers of a strong Digimon, she would be nearly unbeatable.
However, Jin Kazama from Tekken also has a strong claim. He has the Devil Gene which gives him enhanced abilities. He can transform into a more powerful form and has years of martial arts training. If he could somehow learn to control Naruto's chakra or ninja techniques, he could become extremely powerful. In a Tekken Naruto fanfic, it might depend on how the powers are combined and who has the better strategy in a fight.