Who are the best characters to pair with Kaneki Ken in crossover fanfiction?

In a crossover with 'One Piece', Blackbeard would be an interesting character to pair with evil Kaneki. Both are complex and morally ambiguous characters. Blackbeard's thirst for power and his ability to manipulate situations could be enhanced by Kaneki's ghoul powers. In the 'Fairy Tail' universe, Jellal could be a good match. Jellal has his own dark past and his powerful magic could interact in an exciting way with Kaneki's kagune. They could either be rivals or form an uneasy alliance.

Characters like Naruto from the Naruto series could be an interesting pairing. Naruto's positive attitude and his own powerful jutsu could be a contrast to Berserker's darker nature. Also, Captain America from the Marvel Universe would be a good match. Cap's leadership and moral compass against Berserker's more chaotic nature would create an interesting conflict. And for a more fantasy - based pairing, Legolas from The Lord of the Rings. His archery skills and elven grace against Berserker's brute strength would be a great visual and story - wise combination.

Gintoki from 'Gintama' could be paired with Shizuo. Gintoki's laid - back yet strong - willed personality next to Shizuo's short - tempered and powerful nature would result in some hilarious and action - filled interactions. And Spike Spiegel from 'Cowboy Bebop' could also be a great partner for Shizuo in a crossover. The cool and collected Spike next to the hot - headed Shizuo would make for an interesting character study and some great action sequences.

Dante from Devil May Cry would be an excellent character to pair with Doomguy. Dante is a stylish demon hunter, and when combined with Doomguy's brute force approach, it would create some really cool action scenes. Also, Samus Aran from Metroid could be a good match. Samus' exploration skills and Doomguy's combat abilities could lead to an interesting story, especially if they are in a shared alien - infested environment.

One idea could be a crossover with the world of 'Fullmetal Alchemist'. Kaneki Ken could be a chimera created by some dark alchemical experiment. His kagune could be seen as a strange alchemical creation. Another could be a crossover with 'Attack on Titan', where Kaneki joins the Survey Corps and uses his kagune to fight Titans in a unique way.

A crossover with "The Avengers" would also be cool. Kaneki could team up with the Avengers to fight against a common enemy that threatens both the human and ghoul worlds. His unique abilities would add an interesting element to the superhero team.

Ichigo could also be paired with Light Yagami from 'Death Note'. It would be an interesting clash of ideologies. Ichigo, who fights for justice in his own way, and Light, who has his own warped sense of justice. Their interactions could lead to some really thought - provoking storylines.

In a crossover with One Piece, Luffy would be an interesting match for Sakura. Luffy's carefree but determined nature along with his stretchy powers could work well with Sakura's more serious and medical - based abilities. They could embark on a journey together in the crossover, facing various challenges and making new friends along the way.

In crossover fanfiction, Luke Skywalker would be an excellent character to pair with Darth Revan. Luke's journey from a farm boy to a Jedi Master could contrast with Revan's fall and redemption. Another good choice could be Gandalf from The Lord of the Rings. The clash between Gandalf's wisdom and Revan's Sith - influenced knowledge would be interesting. Also, Shepard from Mass Effect could be a great pairing. Their different approaches to leadership and combat would create an engaging story.

Archive of Our Own (AO3) is a great place to start. It has a large collection of fanfiction from various fandoms, including many Ken Kaneki crossovers. You can use the search function to narrow down your options by specific crossovers or tags.