Well, for instance, Captain America's leadership skills could be combined with North's knowledge of different realms. North could lead the Avengers into his world if they needed to hide or strategize in a different environment, and Cap could keep everyone in line and focused on the mission.
Thor's lightning powers and Jack Frost's ice powers could create some really cool combinations. They could make a sort of frozen lightning attack. Jack could freeze the moisture in the air, and Thor could then charge it with his lightning, creating a powerful and unique weapon against their enemies. Also, Hawkeye's precision could be enhanced by Tooth Fairy's ability to fly and scout. She could give him real - time information about the enemy's position from above, allowing him to take more accurate shots.
The Hulk's strength combined with Bunny's agility would be quite a force. Bunny could use his speed and agility to lead the Hulk to the right targets, and the Hulk could then use his brute strength to smash through any defenses. And let's not forget about Black Widow's combat skills and Sandy's ability to create things out of dreams. Sandy could create distractions in the form of dream - like illusions, while Black Widow sneaks up on the enemy and takes them out.
Iron Man's technology could be combined with the magic of the wizarding world. For example, he could use his repulsor rays along with a magic amplification spell. Harry Potter's ability to use the Patronus charm could be used in tandem with Captain America's leadership skills to inspire the combined group in a battle.
Naruto's Rasengan could be combined with Kirby's inhaling ability. Kirby could inhale an object and then spit it out with the force of a Rasengan. Or Naruto could use his shadow clones and have each clone team up with a Kirby ability. For example, one clone could work with Kirby's sword ability to fight enemies.
If we consider the combination of abilities in a Naruto Castlevania crossover fanfiction, we can look at some cool scenarios. For instance, Kakashi's Sharingan and his Lightning Blade technique could be combined with the electrical - based attacks in Castlevania. He could use his Sharingan to analyze the weaknesses of Castlevania enemies and then strike them with a more powerful Lightning Blade enhanced by the electrical powers from Castlevania. Hinata's Byakugan could be used to detect hidden passages and secrets in the Castlevania castles, which are often full of mysteries. Her Gentle Fist technique could also be adjusted to work against the more otherworldly anatomies of Castlevania creatures. And the Castlevania characters' ability to manipulate dark energy could be merged with Naruto characters' chakra control, creating a whole new set of skills for both groups of characters.
Naruto's Rasengan could be combined with Aladdin's acrobatic skills. Imagine Aladdin using his speed and agility to get close to an enemy while Naruto forms a Rasengan, and then Aladdin quickly delivers the Rasengan - powered attack. It would be a very effective and unexpected combination.
Edward's mind - reading ability could be really useful for Batman. He could help Batman anticipate the moves of criminals before they happen. In return, Batman's detective skills and high - tech gadgets could help the Cullens or Bella in their battles against other vampires. For example, Batman could create some kind of ultraviolet light device that is more effective against vampires than what they've seen before.
If Naruto's Rasengan was combined with Mickey Mouse's magic, it could create a super powerful attack. The spinning energy of the Rasengan could be enhanced by Mickey's magic to be even more destructive. Also, Sasuke's Sharingan could be used in interesting ways with Disney characters. For example, if he used it on Tinker Bell, he could copy her ability to fly for a short time.
The Overwatch characters' abilities could enhance the Destiny guardians' combat in many ways. For instance, Mercy's healing ability could keep the guardians alive longer in tough battles. In return, the guardians' powerful light - based attacks could provide extra firepower for the Overwatch heroes. For example, a Warlock's Nova Bomb could be used in a large - scale battle in Overwatch's maps to clear out groups of enemies. The Titans' shielding abilities could also be used to protect key Overwatch characters like Reinhardt protecting a healer.
In a crossover, Kakashi could be an interesting character to combine with the Halo universe. His Sharingan allows him to use various jutsu. If he were in the Halo universe, he could use his teleportation jutsu in combat situations. He could also use his knowledge of different ninjutsu to create new strategies against the Halo enemies. And perhaps he could teach some of the UNSC soldiers how to better sense their surroundings, similar to how he uses his Sharingan in Naruto.
If Naruto's Rasengan was combined with a Twilight vampire's strength, it could create a super - powerful attack. The vampire could use its speed to quickly close in on an enemy and then deliver the Rasengan with enhanced force. Or, if a werewolf in Twilight combined their enhanced senses with Naruto's Shadow Clone Jutsu, they could create a more effective surveillance system. The werewolf could sense enemies from afar and then send out clones to gather more information or launch preemptive attacks.
If we consider the abilities of the characters in a Naruto - Overlord crossover. Naruto's shadow clones could be used in interesting ways in the Overlord world. For instance, they could be used as decoys in battles against powerful undead or magical creatures. In return, the magic of the Overlord world could be used to enhance the clones, like giving them temporary magical shields. Also, the Overlord's ability to control undead could be combined with some of the mind - control jutsu from Naruto, creating a really unique and powerful form of domination over enemies.