Think about Sakura's superhuman strength. In a RWBY crossover, she could use that strength to help move heavy objects or in close - combat against the Grimm. Her medical ninjutsu could also be combined with RWBY's technology. Maybe she could develop new ways to heal using Dust - infused medical tools. For the RWBY characters, Yang's Semblance of absorbing damage and then releasing it as power could be combined with Naruto's ability to draw on the Nine - Tailed Fox's power. Yang could learn to better control the absorbed energy by using some of Naruto's chakra control techniques.
Well, Naruto's Rasengan could be combined with Ruby's Crescent Rose. For example, Ruby could use the spinning force of the Rasengan and incorporate it into her scythe attacks. It would add a new level of power and unpredictability. Sasuke's Chidori could be used in a similar way, perhaps with Weiss' Glyphs. She could create Glyphs that enhance and direct the power of the Chidori for more precise attacks. And Naruto's shadow clones could be used in RWBY battles. They could be used to distract Grimm while the RWBY characters set up more powerful attacks.
Ruby's speed and scythe - wielding skills could be combined with Kaneki's kagune attacks. For example, Ruby could use her speed to quickly dodge an enemy's attack and then Kaneki could follow up with a powerful kagune strike. Weiss's glyphs could be used to enhance or control the movement of a ghoul's kagune. Blake's shadow clones could be used to confuse the ghouls while the Tokyo Ghoul characters attack from different angles.
Well, Soldier 76 has his healing ability. In a crossover, this could be used to keep RWBY characters alive during tough battles. Let's say Weiss is in a fight and gets injured. Soldier 76 could heal her up quickly so she can continue using her Glyphs. His ultimate ability, the Tactical Visor, could be combined with Ruby's sniper skills. They could both target enemies from afar and take them out more efficiently. Also, his combat experience and training could be shared with the RWBY team, improving their overall combat strategy. And the RWBY characters' unique Semblances could also enhance Soldier 76's abilities. For instance, if he teams up with Pyrrha, her polarity semblance could be used to manipulate the path of his bullets.
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.
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.
Naruto's Rasengan could potentially be enhanced with the power of Okami's Celestial Brush. Imagine a Rasengan that can not only cause physical damage but also purify the area it touches, similar to how Amaterasu in Okami purifies the corrupted areas. For the Okami characters, Issun could use his small size and agility in combination with Naruto's shadow clone jutsu. He could ride on the clones and direct them to different strategic positions during a battle. Amaterasu from Okami could combine her fire - like powers with Sasuke's fire jutsu, creating an even more intense and powerful flame attack.
If Pikachu were in the Naruto universe, Naruto could use his Rasengan and Pikachu could add an electric charge to it, creating a super - powerful attack. Sasuke could use his Sharingan to predict the moves of Pokémon in battle and then counter them with his ninjutsu. Sakura, with her superhuman strength, could potentially team up with a Machamp to do some really powerful physical combos.
In terms of speed, characters like Sasuke from Naruto are extremely fast. If combined with the agility of a Descendants character like Evie, they could perform some amazing acrobatic feats. Evie could use her knowledge of potions and such to enhance Sasuke's Sharingan abilities further. Maybe she could create a potion that makes the Sharingan more perceptive or gives it the ability to see through certain types of magic.
If we consider Ben's alien forms like Diamondhead, his crystal - based powers could combine with Naruto's earth - style jutsu. They could create massive crystal and earth structures for defense or offense. And when it comes to Ben's more aquatic - based aliens like Ripjaws, Naruto could use his water - walking and water - style jutsu to enhance Ripjaws' abilities in water. They could also develop new combined techniques, like a water - crystal prison using both their powers.
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 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.