Well, Hinata could be a support character in the G Gundam universe. Her gentle nature could bring a different perspective to the often - intense Gundam battles. She could be involved in the medical or communication aspects of the Gundam teams, while also having her own character growth as she witnesses the battles and the courage of the pilots.
Naruto could be a new recruit in the Jungle Fury team. He would bring his ninja skills like running on walls and using kunai. His rasengan could be a super - powerful attack against the villains in the Jungle Fury world.
Well, Naruto's godlike abilities would likely change the power dynamic. He could easily take on Titans single - handedly. For instance, his ability to transform into the Nine - Tails form would make him a giant - sized threat to the Titans. His chakra could also be used to heal the injured in the Attack on Titan world, which is something they desperately need.
He could be a new teacher at Hogwarts. Since he's immortal, he has a vast amount of knowledge and skills. He could teach a new subject that combines ninja techniques and magic. For example, he could teach students how to use their magic in a more physical and combat - oriented way, like ninjas do.
Another idea is a crossover where the technology of G Gundam is introduced into the Naruto world. Maybe the Hidden Villages start to develop Gundam - like mechas using their own unique ninja techniques. This would completely change the dynamics of battles in the Naruto universe.
Naruto characters could fit into the FGO lore in various ways. For instance, Naruto's world has different levels of power and abilities, much like the Servants in FGO. His ability to use chakra could be seen as a form of magic in the FGO universe. So, a Naruto character like Kakashi could be a Caster, using his wide knowledge of jutsus as spells.
In fanfiction, Goku could be brought into the Avengers' world through a multiverse - related event. Once there, his Saiyan biology would make him stand out. He doesn't need high - tech gadgets like Iron Man or super - soldier serums like Captain America. His raw power is all natural. This could cause some envy among some of the Avengers at first. But as they see his selfless nature in battle, they would come to respect and rely on him. He could be the key to defeating enemies that the Avengers alone couldn't handle, like powerful cosmic threats that require his level of brute strength and energy projection.
Well, she could be a part of a special mission. Since she has experience in handling complex situations in the Naruto world, she could bring that knowledge to the My Hero Academia world. Her rasengan - like attack (adapted to fit the quirk concept) could be a powerful weapon against villains. And she would form relationships with the other students, like Ochaco. They could bond over their determination to be great heroes, although their methods are quite different.
Naruto could use his ninjutsu against the zombies. His Rasengan would be very effective in taking out groups of zombies at once. He could also use his chakra to enhance his physical abilities and jump over hordes of zombies.
Well, Naruto himself could fit in as a powerful ally. His speed and strength would be very useful in the battles against the daemons. He could also teach the characters in Final Fantasy 15 about perseverance and never giving up, which is a big part of his character. For instance, he could inspire Noctis to be more confident in his role as the king.
Naruto characters could fit in by bringing their unique powers. For instance, Sasuke's Sharingan could be used to predict enemy moves during heists in Saints Row 3. It would give the Saints an edge in combat situations.