Naruto's shadow clone technique could be combined with Goku's ability to split into multiple versions of himself during the Kaioken technique. This would create a horde of super - powered clones that could overwhelm opponents. Also, Naruto's Rasengan could be infused with the energy of a Ki blast, making it even more powerful. And Goku's Instant Transmission could be used in combination with Naruto's speed to create an unbeatable movement ability.
One way their abilities could combine is through Naruto's transformation jutsus and the DBZ characters' various power - up forms. For example, Naruto's transformation into the Six Paths Sage Mode could be enhanced by Goku's Ultra Instinct. The calm and precise movements of Ultra Instinct could be applied to Naruto's already powerful Six Paths Sage Mode, making his attacks and defenses even more effective. Another combination could be between Naruto's summoning jutsu and the DBZ characters' ability to call upon the power of the Dragon Balls. Maybe Naruto could summon a giant dragon - like creature using his chakra, and this creature could have some of the powers associated with the Dragon Balls, such as granting wishes or having the ability to manipulate energy in a way similar to the Dragon Balls.
The characters' abilities would combine in really unique ways. Naruto's ability to sense chakra could be used to detect hidden enemies or traps in the SAO world. The ninjas from Naruto could teach the SAO characters stealth techniques. In return, the SAO characters could introduce the Naruto characters to advanced virtual reality technology concepts. For example, Sinon's sniper skills could be combined with Kakashi's long - range attack techniques. And Hinata's Byakugan could be used to analyze the weaknesses of SAO bosses more accurately, which could then be exploited by Kirito's swordsmanship.
Naruto's ability to create shadow clones could combine with a mutant's telepathy. For example, he could send his clones to different locations and the telepathic mutant could communicate with each of them simultaneously, gathering information from all over. This would be a great way to gather intelligence or set up strategic attacks.
Naruto's ninjutsu and Tonks' magic could create some really cool combinations. For instance, Naruto could use his Rasengan while Tonks uses her magic to enhance its power. Or Tonks could change into Naruto to distract enemies while the real Naruto attacks from a different angle.
Naruto's ability to use chakra could be combined with Sebastian's demonic powers in interesting ways. For example, Naruto could use his chakra to enhance Sebastian's physical attacks. Or Sebastian could use his knowledge of the supernatural to help Naruto better understand and control his bijuu chakra.
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.
Imagine if Spider - Man had Naruto's chakra control. He could use his webs in a much more precise and powerful way. He could also potentially use chakra to enhance his already amazing acrobatic skills. On the other hand, Naruto characters could learn from the strategic thinking of characters like Captain America. Naruto himself could use some of Cap's leadership skills to better lead his ninja teams in battle. And Sasuke could use some of the stealth and infiltration techniques that Black Widow is known for.
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.
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.
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.