The Joker is another character. A Batman - Joker hybrid fanfiction could explore a really dark and twisted concept. Maybe they are two parts of the same being, split by some strange experiment. This would lead to a lot of internal conflict within the hybrid character, as the Batman side tries to fight the Joker side's chaos.
Robin is also popular. A hybrid of Batman and Robin could be interesting. It could be like a mentor - protege bond taken to a new level, where they are physically and mentally combined in some way. They could share powers and knowledge more directly, and it would change the way they operate as a team in Gotham.
Catwoman is often paired with Batman in hybrid fanfiction. Their relationship in the original comics is already complex and full of tension. In a hybrid scenario, they could be part of a new species together, like a feline - human hybrid race. This would enhance their connection and the drama between them.
Cthulhu is often paired with Nyarlathotep. Since they are both from the Lovecraftian mythos, their combined presence can create a much darker and more chaotic story. Another character could be Sherlock Holmes. The contrast between Holmes' rational mind and Nyarlathotep's otherworldly chaos makes for an interesting dynamic. Holmes would try to solve the mystery of Nyarlathotep's appearance and actions, while Nyarlathotep would be constantly trying to undermine Holmes' sanity.
Zoro is another popular character. He and Luffy have a strong bond, and in Gear 5 fanfiction, they might fight together in a new and more coordinated way. Zoro could be using his swordsmanship to complement Luffy's wild and unpredictable Gear 5 attacks, creating a powerful combination against their enemies.
Alice Angel is often paired with Baby Bendy. Their interactions can range from her being a sort of mother figure to him, guiding him through the dark and twisted world, to more complex relationships where they might have conflicting goals but still a connection.
Another popular character to be paired with the 'brother of Naruto' is Hinata. The brother could be protective of Hinata's relationship with Naruto or he could develop his own feelings for her, creating a love triangle situation which adds a whole new layer of drama to the fanfiction.
Luigi is often paired with Vampire Waluigi in fanfiction. Since they are counterparts in the original Mario universe, it creates an interesting dynamic in the vampire - themed stories.
One popular character paired with Kazui Kurosaki in fanfiction is Ichigo Kurosaki, his father. Writers often explore their father - son relationship in different ways, like Kazui learning new skills from Ichigo.
Sometimes, the Black Joker is paired with other anti - heroes in fanfiction. These pairings can lead to interesting dynamics as they might team up against a common greater evil or have power struggles among themselves.
Another popular character paired with her could be some of the other young vampires. They might interact with her, share their experiences of being different, and form a sort of vampire youth group in the fanfiction. They could go on adventures together, learn from each other's powers, and face challenges as a team.
Maybe Elijah Mikaelson could be paired with Davina in pregnant fanfiction. He is a very noble and protective character. If Davina was pregnant with his child, he would surely go to great lengths to ensure her safety and the well - being of the unborn baby. The story could explore their relationship growing deeper as they face this new chapter in their lives.
Naruto can also be paired with Dark Kakashi. Naruto's unwavering belief in the good of people could contrast sharply with Kakashi's darker self. It might lead to situations where Naruto tries to bring back the old, more positive Kakashi, and through their interactions, both characters grow and learn more about themselves.