Papyrus also shows up often. His relationship with Sans adds an interesting dynamic to the crossovers. And his own unique personality and abilities can lead to various plot developments when combined with other crossover elements.
One of the popular crossover characters could be Steven from 'Steven Universe'. His kind - hearted nature and unique powers would make for an interesting interaction with Star. Another might be Finn from 'Adventure Time'. His adventurous spirit would contrast well with Star's own. And of course, Marceline from 'Adventure Time' too. Her cool and somewhat edgy personality could bring a new dynamic to the fanfiction when paired with Star.
In some cases, characters like Luffy from One Piece are also quite popular in 'naruto vs crossover fanfiction'. Luffy's rubbery body and carefree attitude can be a great contrast to Naruto's more serious ninja side. When they cross paths in fanfiction, their different goals and ways of approaching challenges can lead to some really fun and unexpected storylines.
One interesting concept could be the clash of different universes' rules. For example, when Sans from the Undertale universe meets characters from other crossovers, the way their powers interact. Sans' unique abilities like teleporting and bone attacks might be affected by the new environment or powers of the crossover characters.
Skeletor from He - Man is really interesting. His evil nature and magic powers create a great contrast with the Thundercats' more heroic and noble qualities. It leads to some intense battles and power struggles.
Rey from Star Wars and Weiss Schnee from RWBY are also commonly used in crossovers. Rey's journey of self - discovery and her growing power can be paralleled with Weiss's own development as a huntress. Additionally, Han Solo and Yang Xiao Long can make for a fun crossover. Han's roguish charm and Yang's brash and confident personality can lead to some humorous and action - packed adventures together.
Tucker is also well - liked. His over - the - top personality and his sword skills can add a lot of action and humor to crossovers. He might get into all sorts of crazy adventures with characters from other universes in the crossover archive.
There's also the 'Ripley' character from the Alien series. Since she has so much experience dealing with Aliens, she can be a really interesting addition to a crossover fanfiction. She could potentially team up with a Predator to take on the Alien threat in a new and different way.
Madara is quite commonly paired with Hashirama in crossover fanfiction. Their complex relationship in the original Naruto series makes for interesting scenarios when they are placed in different crossover settings. They could be forced to work together against a new threat or their rivalry could take on new dimensions in a different world.
Gwen Tennyson is often paired with Ben 10000. Since they are related in the original series, it's interesting to see how their relationship might be different in a crossover scenario. Maybe they have to work together to save the universe in a more complex way than before.
Nightwing is often paired with Batgirl. They have a history together, and in crossover fanfiction, they can have some great team - up moments. Whether it's fighting crime in Blüdhaven or Gotham, their combined skills are quite formidable. Also, Harley Quinn is a popular character to pair with Batgirl. Their interactions can range from comical to intense, as they have very different personalities but can find common ground in certain situations.