Some also like to use characters from the Harry Potter series, like Harry himself or Hermione. Their magic system is different from that of Unlimited Blade Works, so when they cross over, it can be a great opportunity to explore how different magics interact. For example, Hermione's intelligence and knowledge of magic could help Shirou in understanding his own powers better, or they could face challenges together that require both their magical skills.
One Piece's Luffy is also quite popular. His carefree and determined personality contrasts with the more serious tone of Unlimited Blade Works at times. His devil fruit powers can introduce some really wacky and interesting elements into the story. Additionally, characters like Goku from Dragon Ball Z are frequently used in crossovers. His super - strong fighting abilities and Saiyan heritage can lead to epic battles against the Servants in the Unlimited Blade Works world.
Another concept is the exploration of different timelines within the crossover. Maybe there's a timeline where Shirou makes different choices due to the influence of the crossover elements. This can lead to a whole new set of battles and relationships. Also, the combination of different magic systems from the crossovers can create really cool and unexpected effects in the story.
In Mortal Kombat 11 crossover fanfiction, some of the most popular crossover characters are from other fighting games like Street Fighter. For example, Ryu. His unique fighting style and the contrast between his more disciplined and honorable approach compared to Mortal Kombat's often brutal and underhanded tactics make for interesting fanfic scenarios. Another popular one could be characters from DC Comics if there's a crossover in that regard. Superman or Batman can bring a whole new dynamic to the Mortal Kombat universe with their superpowers and detective skills respectively.
Definitely Naruto and Superman. They are both iconic characters in their respective universes. Their different power sets make for an interesting comparison. Another popular crossover is between Sasuke and Batman. They both have a dark and brooding side. And of course, Sakura and Wonder Woman. The contrast between Sakura's ninja skills and Wonder Woman's superhuman abilities is appealing.
Another good choice would be Harry Potter. Imagine Shirou in the wizarding world. He could use his tracing ability to create magical items, and he could also learn new spells from the Hogwarts professors. They could team up to fight against dark wizards.
Edward Cullen and Harry Potter are often popular. The contrast between Edward's vampire nature and Harry's wizardry makes for an interesting dynamic. Fans like to imagine how they would react to each other's powers and the situations they face.
Klaus Mikaelson is definitely one of the most popular. His complex and often villainous nature in The Originals makes him a fascinating character to bring into the world of The Vampire Diaries. He can stir up all kinds of trouble and create new dynamics among the characters in Mystic Falls.
Well, characters from 'One Piece' can be quite popular in 'kuroko no basuke crossover free fanfiction'. Luffy's elasticity could be reimagined as a strange yet effective way to move on the basketball court. And then there are characters from 'Slam Dunk'. Since it's also a basketball - related anime, their crossovers can be very engaging as they bring in a different era of basketball styles and attitudes.
Trudy Chacon can be a really interesting character in Avatar 2009 crossover fanfiction. She's a human who has a certain level of empathy for the Na'vi, and in crossovers, she could play a role in bringing different groups together. Another popular one is Norm Spellman. His scientific knowledge and his own journey in the Avatar world can be explored further in crossovers.
Canderous Ordo is popular too. His Mandalorian background gives him a unique edge. In crossovers, he could bring the tough and honor - bound Mandalorian culture to new situations. Maybe he teams up with other Mandalorian - like characters from different universes or time periods in a crossover story.
Some original majin characters created by fanfiction writers themselves also gain popularity. These characters are designed specifically to fit into the crossovers they are part of. For example, a majin assassin might be created and then crossed over into a Naruto - like ninja world, where their unique majin abilities make them a formidable foe or an unexpected ally.