Seto Kaiba and Gary Oak would make for a fascinating pair in a crossover fanfic. Kaiba's arrogance and Gary's self - assuredness could lead to some intense rivalries. They might compete to see who can be the best in both the Yugioh and Pokemon worlds. Another interesting character would be Serena. Her kind - hearted nature could be a contrast to some of the more intense Yugioh characters. She could form bonds with the Duel Monsters in a different way than the other characters, perhaps using her compassion to calm down some of the more aggressive ones.
Ash Ketchum would be a must - include. Imagine him using his knowledge of Pokemon to master Beyblade battles. Also, Gary Oak could be his rival in this new form of combat. From the Beyblade side, Tyson could be an interesting addition. He could bring his Beyblade skills and learn about Pokemon. And of course, Pikachu as a character - like presence in the form of a Pikachu - themed Beyblade would be really cool.
Definitely Naruto himself. His energetic and determined personality would be a great contrast to the often more somber characters in Skyrim. Also, characters like Sasuke could be interesting. His brooding nature and powerful Sharingan abilities would make for some great interactions in Skyrim's dangerous world. And from Skyrim, the Dragonborn would be a must - include. The clash or cooperation between the Dragonborn's Thu'um and Naruto's jutsu would be really exciting to write about.
The Master Chief is an obvious choice. His stoic and powerful presence would be really interesting in the Skyrim setting. He could be like an otherworldly hero, and his Spartan abilities would make him a force to be reckoned with against Skyrim's foes.
For the Naruto side, Rock Lee would be really cool. His taijutsu - only fighting style could be really different from what the Halo characters are used to. In Halo, the Arbiter could be an interesting character to include. His story of redemption and his unique combat skills could lead to some great storylines. And of course, Hinata could also be included. Her shy but strong - willed nature could be a nice addition. She might befriend some of the Halo characters and learn new ways to fight from them.
Definitely Pikachu from Pokemon. Pikachu is super cute and its electric powers would be really cool to see in Equestria. And from My Little Pony, Twilight Sparkle would be great. She's really smart and into magic, so she could be very interested in learning about Pokemon. They could have some really fun interactions together, like Pikachu using its electricity to light up Twilight's library when there's a power outage or something.
Charizard would also be great. It's a large, dragon - like Pokemon that could fit well into the Star Wars aesthetic. It could be a wild Pokemon that a group of rebels or stormtroopers encounter on an unexplored planet. It could either befriend them or become a formidable enemy depending on how they interact with it.
Definitely the Lotus from Warframe. She could be like a wise advisor to the Jedi Council, sharing her knowledge of the Orokin and the Tenno. And Darth Vader would be a great addition too. Imagine the confrontation between him and a powerful Warframe like Excalibur. It would be an epic battle of light and dark powers.
If it's a crossover with 'Game of Thrones', Tyrion Lannister would be a very interesting character to include. His wit and intelligence would play well against the characters in Brooklyn Nine - Nine. He could outsmart some of the criminals while also getting into comical exchanges with Jake and the gang. Another great addition would be Arya Stark. She could show off her combat skills and stealth, and it would be interesting to see how she interacts with Rosa, who also has a tough - as - nails attitude. Also, Jon Snow could be included. His sense of honor and leadership could have an impact on how the precinct operates, especially when dealing with difficult cases.
Definitely Chris McLean from Total Drama Island. He could be the link between the Total Drama Island world and the other crossover world. If it's a crossover with a superhero show, he could be the one to introduce the superheroes to the island. Another interesting character would be Duncan. His bad - boy attitude would make for great interactions in any crossover. For example, if crossed with a pirate - themed show, he'd probably try to take over the pirate ship. Also, Gwen would be a great addition. Her gothic nature would contrast well with characters from more light - hearted shows in a crossover. For instance, if crossed with a My Little Pony crossover, her dark aesthetic would stand out.
Another great pairing could be Sakura and Misty. Sakura is a strong - willed and intelligent ninja, while Misty is a feisty and experienced Pokemon trainer. Misty could help Sakura understand more about water - type Pokemon, and Sakura could teach Misty some basic medical ninjutsu in case of Pokemon injuries during battles.