One of the most interesting pairings could be Giles and Doctor Strange. Both are well - versed in the ways of magic, though from different universes. They could exchange knowledge about different spells and artifacts. And then there's Spike and Black Widow. Spike has his vampire charm and combat skills, and Black Widow is a master spy and fighter. Their interactions would be full of tension and sass as they work together or perhaps even compete a bit while fighting a common enemy.
Buffy and Carlisle would be an interesting pairing. Carlisle's calm and ethical approach to vampirism could contrast with Buffy's more action - oriented slaying. They could have deep discussions about the nature of good and evil in their respective worlds. Another interesting pair could be Willow and Alice. Willow's magic and Alice's precognition could lead to some really cool interactions and joint efforts to foresee and prevent threats.
Buffy and Brennan would be a great pairing. Buffy's street - smart and intuitive nature combined with Brennan's scientific and logical mind would create a lot of interesting interactions. They could clash at first due to their different ways of approaching problems, but then learn to respect and rely on each other.
I think Buffy and Edward would be a really interesting pairing. Buffy is used to dealing with vampires that are evil, and Edward is a 'good' vampire. Their interactions would be full of tension. Buffy might be skeptical of Edward at first, thinking he's hiding something more sinister. And Edward would be fascinated by Buffy's strength and courage, but also a bit intimidated by her no - nonsense attitude.
Definitely Naruto and Iron Man. Naruto is this energetic, determined ninja, and Iron Man is this brilliant, sarcastic inventor. Their personalities are so different yet they could learn a lot from each other. Iron Man could be intrigued by Naruto's chakra system and try to replicate it in some way, while Naruto would be fascinated by all of Iron Man's high - tech gadgets.
Supergirl and Black Widow would be a great pairing too. Black Widow could teach Supergirl some stealth and espionage skills, while Supergirl could show Black Widow the power of flight and super - strength. They could also bond over their experiences of being different in their respective worlds.
I think Thor and Wonder Woman would make an amazing pair. They both come from god - like lineages. Thor with his Asgardian powers and Wonder Woman with her Amazonian and divine powers could have some epic battles together against common foes. Their different yet powerful fighting styles would complement each other well.
For an Arrow - Avengers crossover fanfiction, some really interesting character pairings could emerge. For instance, Malcolm Merlyn and Loki. Malcolm is a master manipulator and Loki is the God of Mischief. They could either team up to cause chaos or be in a constant battle of wits. Also, Cisco Ramon from The Flash (since he often crosses over with Arrow) and Bruce Banner. Cisco could be fascinated by Banner's scientific knowledge and Banner could be interested in Cisco's work on the multiverse. And of course, Quentin Lance and Nick Fury. Quentin, as a police detective, and Nick Fury, as the head of S.H.I.E.L.D., could share their insights on how to keep their respective cities and the world safe.
Definitely Daredevil and Black Widow. Daredevil's enhanced senses and martial arts skills combined with Black Widow's espionage expertise and combat abilities would make for an exciting duo. They could work together on a stealth mission, with Daredevil using his senses to detect hidden threats and Black Widow using her gadgets and charm to get them in and out of dangerous situations.
I think Master Chief and Captain America would be an interesting pairing. Master Chief is a super - soldier in his own right from a high - tech future, while Captain America is a super - soldier from the past. Their different combat styles and values would create an interesting dynamic.
Another great pairing would be Superman and Captain America. Superman is an alien with god - like powers, while Captain America is a human with peak physical and moral strength. Cap could teach Superman about the value of human tenacity and leadership on a more down - to - earth level. And Superman could show Cap what true superhuman power looks like. They could work together to inspire the rest of the Avengers and any other heroes they encounter in a battle.