The Jedi's ability to sense the Force could help Percy in his adventures in the Clone Wars universe. They could sense danger before Percy does, and he could then use his powers to counter it. For example, if there was a hidden Sith trap, the Jedi would sense it and Percy could use his powers over water to create a shield or an escape route. And on the other hand, Percy's powers could add an element of unpredictability to the Jedi's battles. His unique demigod powers are not something the Sith or the droids would be used to dealing with, which could give the good guys an edge.
If we consider the werewolves in Twilight, their strength and speed could be combined with Percy's strategic thinking. Percy, being a demigod, has been in many battles and could lead the werewolves in a more effective way against common enemies. For example, in a fight against a new supernatural threat, Percy could use his knowledge of different mythological creatures to come up with a battle plan, while the werewolves use their physical abilities to execute it.
The flying ability of the Maximum Ride characters combined with the demigod powers of Percy Jackson's characters could create some really cool scenarios. For instance, they could fly above a battlefield and the demigods could use their powers like Percy's control over water to rain down attacks on enemies from above. Or Annabeth could use her strategic mind to direct the flying group on the best paths to take during a fight or a mission.
Percy's ability to control water could combine with Michael's celestial powers in interesting ways. For instance, Michael could use his divine energy to superheat Percy's water, turning it into steam that can be used as a powerful weapon or a means of transportation. Or Percy could use his water powers to create a reflective surface for Michael's light - based attacks to be amplified and redirected.
The demigods have a variety of powers. Annabeth's strategic mind could be combined with Alice's ability to see the future. They could plan out battles or ways to avoid danger. If a demigod like Jason with his lightning powers teams up with the vampires, they could use the lightning to create distractions or even as a weapon against common enemies. The vampires' super strength and speed could also be useful in getting the demigods out of tight spots quickly.
The Covenant's energy weapons and their unique alien abilities could mix with the Star Wars technology and Force powers in various ways. The Grunts could be like the Ewoks in terms of being small but fierce when combined with the right support. The Elites' combat skills might be on par with some of the Star Wars bounty hunters, and together they could form an interesting team.
The werewolves' enhanced senses in Twilight could be paired with a Star Wars character's combat skills. Imagine a werewolf with the combat training of a Clone Trooper. Their already acute senses would make them an even more formidable opponent in battle. And if a Star Wars character had the werewolf - like ability to sense danger, they would be much better at avoiding ambushes and predicting enemy moves.
If Percy and Aphrodite were siblings in a fanfiction, their abilities could combine in some cool ways. Percy has his water - based powers, being able to control water, breathe underwater, and so on. Aphrodite has the power to manipulate love. They could potentially use their powers together in a battle. For example, Percy could create a huge wave to surround their enemies, and Aphrodite could then make those enemies fall in love with each other, causing chaos and distraction within their ranks.
Well, Percy's speed and agility, which he uses in combat in his own world, could be enhanced in the more dangerous and unpredictable world of Bloodborne. He might be able to dodge the attacks of the beasts more easily. On the other hand, the weapons and fighting styles of Bloodborne hunters could be adopted by Percy. For example, he could use a trick weapon in combination with his sword - fighting skills.
Well, Percy's ability to control water and Frozen characters' ice powers could create some cool interactions. For example, Percy could make a stream of water and Elsa could freeze it to create an ice bridge. It would be a great way for them to traverse difficult terrains.
The bending abilities from Avatar: Pandora could combine with Naruto's chakra - based ninjutsu in interesting ways. For instance, a water bender could enhance a water - style ninjutsu by adding their unique bending style to it, making it more powerful and fluid.