One common theme is a race or a competition between the two speedsters. Since both Flash and Quicksilver are known for their super - speed, it's exciting to see them compete in a friendly or not - so - friendly race. Another theme could be them teaming up against a common enemy. They might combine their speed powers to take on a powerful villain.
One possible scenario could be that Quicksilver uses his super - speed to save an Avenger from a sudden attack. His speed would be a great asset to the Avengers in a fight. Maybe he teams up with Scarlet Witch, his sister, who is also involved with the Avengers in some storylines.
Naruto would be very curious about Wolverine's adamantium claws and his ability to heal. He would approach Wolverine with his usual friendly and open - minded attitude. Wolverine might be initially skeptical of Naruto's bright - eyed naivete but would come to respect his determination. They could start by sparring, with Naruto using his shadow clone jutsu and Wolverine using his claws. As they interact more, they would start to understand each other's values, like Naruto's belief in friendship and Wolverine's sense of loyalty, and form an unlikely alliance.
Fanfiction.net is another option. It has a large collection of fan - created works. However, the tagging system might not be as precise as AO3. But with a bit of digging and using the search bar for 'Flash meets Quicksilver', you may find some interesting fanfictions.
Wonder Woman could also be a likely ally. She is a warrior at heart and would appreciate Wolverine's fighting skills. She is used to dealing with strong - willed individuals, and Wolverine definitely fits that bill. They could bond over their combat expertise and their sense of justice, even if they come from different worlds.
He could introduce new combat techniques to the Avengers. Since he moves at super - speed, he might have ways of fighting that the Avengers haven't seen before. For example, he could create a mini - tornado by running in circles really fast around an enemy.
One possible plot could be that Naruto, while on one of his travels in search of new jutsu or on a mission, accidentally stumbles into the X - Men's universe. There he meets Wolverine. At first, they might be wary of each other. Naruto could be intrigued by Wolverine's claws and his regenerative ability, while Wolverine might be curious about Naruto's chakra and his ninja skills. They could end up teaming up to fight a common enemy, perhaps a villain who has the ability to disrupt both the ninja world and the mutant world.
In a 'Spiderman meets Wolverine fanfiction', they might start off as rivals. Wolverine could be annoyed by Spiderman's constant chatter. But then, they could team up to fight a common enemy like Doctor Octopus. Spiderman's agility and web - slinging skills combined with Wolverine's brute strength and healing factor would make them a formidable duo.
One possible plot could be that Wolverine and Wonder Woman are brought together by a common enemy. Maybe a powerful villain is threatening both the mutant world and Paradise Island. They start off as distrustful of each other due to their very different backgrounds and methods. Wolverine is a rough - around - the - edges mutant used to street - level fighting, while Wonder Woman is a noble Amazon warrior. But as they face the enemy together, they learn to respect each other's skills. Wolverine is impressed by Wonder Woman's strength and grace in battle, and she in turn admires his tenacity and ability to keep going no matter how injured he gets.
Perhaps Sabretooth could be the villain. He might be targeting Wolverine specifically, but his actions in a big city draw Spider - Man's attention. Sabretooth's savage nature and powerful claws would pose a great threat. Spider - Man and Wolverine would have to work together to defeat him, with Wolverine having the personal vendetta and Spider - Man the sense of justice for the city.