Percy's water - controlling powers could be a great asset in the SHIELD universe. For example, in a situation where there's a flood or a water - based attack by an enemy, he could easily manipulate the water to turn the situation around. His powers might also be useful in interrogations. He could create a water - based illusion or something similar to intimidate the bad guys.
His powers would fit in a unique way. He could use his ability to communicate with sea creatures to gather intelligence. Imagine if there was a threat coming from the ocean, Percy could talk to the whales or sharks and find out what's going on. Also, his superhuman strength and agility, which he has due to his demigod status, would make him a formidable fighter in SHIELD's combat operations. He could take on enemies that normal agents might struggle with.
If Percy Jackson joined SHIELD in fanfiction, it would be a wild ride. Percy's sword - fighting skills and his connection to the gods would give SHIELD a whole new dimension. He might start by being a bit of an outcast among the agents who don't believe in the Greek gods at first. But when they see his powers in action, like summoning water from thin air or running super - fast on water, they'd be in awe. And he could also help SHIELD deal with any mythological threats that pop up, which the normal agents might not be equipped to handle.
He could be seeking revenge. After being betrayed, Percy might see Shield as a means to get back at those who wronged him. By joining Shield, he may think he can gain the power and resources needed for revenge.
His power over water could be used for stealth operations. For example, he could create a mist to hide agents or himself. Also, for defense, he could raise a water wall around SHIELD facilities.
Well, Naruto's ability to sense chakra could be translated into sensing threats in a different way in the SHIELD universe. He might be able to detect hidden enemies or dangerous substances. His healing ability, which is a result of his chakra control, could also be used to treat injured SHIELD agents. And his experience in fighting powerful and diverse opponents in his own world would give him an edge in strategizing against threats in the SHIELD world.
Well, Goku's powers are mainly based on ki manipulation, which is somewhat similar to magic in the Fairy Tail world. If he joins Fairy Tail, he could probably learn to combine his ki with the magic of Fairy Tail. For example, he might be able to infuse his ki into Natsu's fire magic to make it even more powerful. Also, his teleportation technique, like Instant Transmission, could be a great asset during battles and rescue missions in the Fairy Tail universe.
If Naruto joined the Spriggan 12, his powers would be quite a unique addition. Naruto has his chakra and the Nine - Tails' power. His shadow clones could be used for various strategic purposes. For example, he could send a large number of clones to gather information or create distractions while the real Naruto attacks. Also, his Rasengan and other jutsu could be very effective in combat against the enemies of the Spriggan 12. His ability to sense negative emotions might also help in detecting threats before they become obvious.
Ice powers could fit in by being a new type of power that challenges the existing power dynamics. For instance, in battles, they could change the terrain by creating ice ramps or freezing lakes for strategic advantages.
Well, one possibility could be that Percy uses his skills from his own world to help SHIELD in combat situations. Maybe his ability to control water could be useful in, say, putting out fires caused by super - villains or in creating barriers against enemy attacks. He could also interact with SHIELD agents in a really interesting way, like teaching them some of his own combat techniques.
Percy's powers would definitely change the team dynamics. His water - based powers could provide a new element of defense and offense. For example, he could create water barriers to protect the team or use water jets to attack enemies. This would make the team more versatile in combat situations.
Naruto's powers would be very unique in Mermaid Heel. His chakra, which is different from magic, could offer new ways of combat. For example, his ability to run up walls and across water using chakra control could be a great asset in battles where Mermaid Heel mages might be limited in their mobility.