Rukia is a very popular character to pair with Renji in crossover fanfiction. Their long - standing relationship in the original series makes it interesting to see how they interact in different crossover scenarios. Ichigo is also popular. Given their rival - like relationship in the main story, in a crossover, they could end up as allies against a new common enemy.
In Renji crossover fanfiction, Orihime is often paired with Renji. Her kind and gentle nature contrasts with Renji's more brash and hot - headed personality, which creates a lot of potential for character development and interesting storylines. Another popular character to pair with Renji is Byakuya. Their complex relationship in the original anime can be further explored and twisted in crossover settings, like in a world where they have to team up against a powerful and unknown foe.
In crossovers with other shonen series, characters like Luffy from One Piece can be paired with Ichigo. Their different personalities and power sets would create interesting dynamics. Luffy's carefree nature contrasted with Ichigo's more brooding side could lead to some humorous and action - packed adventures.
Sherlock Holmes is a popular choice. The contrast between the Doctor's time - traveling and otherworldly adventures and Sherlock's deductive reasoning on Earth - based mysteries can create some really engaging stories.
Sonic is a very popular character to pair with Shadow. Their rivalry and yet potential for teamwork makes for great fanfiction. Tails is also often paired with Shadow. Tails' intelligence can complement Shadow's combat skills. And Knuckles is another one. His strength and connection to the Chaos Emeralds can create interesting storylines when paired with Shadow.
One popular theme is power - up. In many 'bleach renji crossover fanfiction', Renji gains new powers or abilities from the crossover. For example, if he crosses into a world with magic, he might learn magic spells. Another theme is culture shock. When Renji enters a different universe, he has to deal with new cultures, like different social norms or ways of fighting. This can lead to some really interesting character moments.
Luffy from One Piece is also a common pairing. Luffy's carefree and adventurous nature combined with Ichigo's more serious and duty - bound personality would lead to some really fun and unpredictable interactions. They could be on a quest in a crossover world, with Luffy's devil fruit powers and Ichigo's Soul Reaper abilities working together in strange and amazing ways.
The Road Runner could be an interesting character to pair with Rango. Their different styles of movement, with Rango being more of a swaggering walker and the Road Runner being super - fast, could create some really fun and comical interactions. Another great pairing would be with Shrek. The contrast between Shrek's ogre - like nature and Rango's lizard self would make for a great story of two misfits coming together.
Oliver Queen (Green Arrow) and Black Widow are often paired. Oliver's combat skills with his bow and arrow combined with Black Widow's martial arts and espionage skills make for an exciting duo. They could be on a mission where they need to infiltrate an enemy base and use their complementary skills to succeed.
Often, Naruto and Agent 47 are paired as they are the main characters from their respective universes. Their interactions can be really interesting as they come from such different worlds. Naruto's exuberance and Agent 47's cold, calculated nature create a great contrast.
Often, Naruto himself is a popular character to pair with characters from Ravel's world. His strong will and determination make him an interesting addition to any crossover story. Another popular pairing could be Sasuke from Naruto with a powerful character from Ravel. Their brooding natures and strong powers can create an interesting dynamic.
Homer and Jiraiya might be a fun pair. Homer loves food and Jiraiya loves women and writing. They could go on adventures together, with Homer being amazed by Jiraiya's ninja powers and Jiraiya being entertained by Homer's simple - mindedness. And they could get into all sorts of trouble, like accidentally stumbling upon a secret enemy base while looking for a good place to eat or write.