Gwen and Raven from Teen Titans would be an interesting pairing. Both are kind of goth - like characters with their own insecurities. They could share their experiences of being different from the mainstream and maybe even form a strong friendship. Also, Cody and Jimmy Neutron could be paired. Cody is always coming up with plans, and Jimmy is a super - smart inventor. They could collaborate on some really cool and high - tech solutions to the challenges in the Total Drama world. It would be fun to see how Cody's street - smart thinking and Jimmy's scientific knowledge work together.
I think Duncan and Zuko from Avatar: The Last Airbender would be a great pair. Duncan has that rebellious and tough - guy attitude, and Zuko has his own complex journey of redemption. They could bond over their edginess and learn from each other's growth arcs. Another good pair could be Lindsay and Stitch from Lilo & Stitch. Lindsay's ditzy but kind - hearted nature would contrast with Stitch's chaotic but loving personality. They would make for some really funny and heartwarming interactions.
Lucy Heartfilia could be paired with Zancrow. She has a different set of abilities and a more diplomatic personality. Her interactions with the hot - tempered Zancrow could lead to some interesting character development for both. She might try to reason with him or use her celestial magic in unexpected ways against his fire attacks.
Link from The Legend of Zelda could be paired with iskandar. Link is a skilled fighter, and iskandar could learn from Link's agility and stealth. In return, iskandar could teach Link about large - scale battle tactics. Also, Alucard from Hellsing would make an interesting pairing. Alucard's dark powers and iskandar's noble leadership would create a contrast, and they could either be enemies or allies depending on the story.
Ken Kaneki could be a great character to pair with Yamori. Their different outlooks on life and their shared experiences in a harsh world could create some intense and thought - provoking interactions.
Gwen is a great choice. They have a bit of an unspoken connection in the show. Cody has a crush on Gwen, so it would be interesting to see how their relationship could develop in a fanfic. Another good option is Sierra. Their dynamic is really complex, with Sierra being overly obsessed with Cody in the show. A fanfic could explore how Cody deals with Sierra's attention and if he could ever see her in a different light.
Gwen from 'Total Drama' would be great. She has a dark and sarcastic personality that could contrast well with the more upbeat characters in other cartoons. Also, Chris McLean as the devious host could create interesting storylines in any crossover. He could be the one to send the Total Drama cast into different cartoon worlds and set up crazy challenges there.
In crossover fanfiction, pairing Josuke Higashikata with Light Yagami from Death Note would be an interesting choice. The contrast between Josuke's heroic nature and Light's more morally ambiguous actions would create a lot of tension. Another good pairing could be Eren Yeager from Attack on Titan. Eren's drive to protect his people and Josuke's ability to use Crazy Diamond in combat could result in a powerful alliance. Also, Saitama from One - Punch Man. Saitama's overpowering strength and Josuke's unique Stand abilities could lead to some comical and action - packed scenarios.
Captain America is an obvious choice. Their long - standing relationship in the original Marvel universe provides a rich backdrop for a crossover. You can explore their friendship or the times when they were on opposite sides. Black Widow is also great. She has a history with the Winter Soldier, and they can team up or have some sort of conflict in a crossover. Another good character to pair with him is Hawkeye. Hawkeye's skills as an archer and his different moral compass compared to the Winter Soldier can create interesting dynamics.
Sherlock Holmes could be an interesting choice. Imagine the brilliant detective trying to figure out Grell's reaper nature and Grell being both fascinated and annoyed by Holmes' deductions. Their interactions would be full of intellectual sparring and comical misunderstandings.
Luffy from One Piece could also be a good pairing. Luffy's carefree and adventurous nature combined with Urahara's mysterious and intelligent personality would create a fun dynamic. They could be on a quest to find a special treasure that has both spiritual and pirate - related significance.
White and Kaneki from 'Tokyo Ghoul'. White's power and her connection to Leo could play an interesting role when paired with Kaneki's ghoul powers. They could both struggle with their dual identities in a crossover scenario, and perhaps find a way to coexist or fight against a common enemy together.