For me, Hinata and Historia would be a great pairing. Hinata is shy but has a lot of inner strength, and Historia has had to find her own strength in a difficult world. They could share their stories of growth and self - discovery. And then there's Gaara and Reiner. Gaara was once an outcast but found his place, while Reiner is dealing with his own identity issues. They could have some deep conversations about their pasts and how they overcame their inner demons while also fighting side by side against common threats.
A likely character pairing would be Levi Ackerman and Kakashi Hatake. Both are highly skilled and stoic characters. They could share their combat expertise and perhaps develop a mutual respect. Also, Armin Arlert and Shikamaru Nara might be paired. Armin's intelligence in strategizing against the Titans could be enhanced by Shikamaru's natural aptitude for coming up with complex plans.
Naruto and Eren would be an interesting combination. Naruto is full of optimism and determination, while Eren has a deep - seated hatred for the Titans. Their different personalities could create some great character dynamics. Naruto could inspire Eren to be more positive in his fight against the Titans, and Eren could show Naruto the harsh reality of the world he lives in.
Naruto and Ruby would be an interesting pairing. Naruto's positive and energetic nature would contrast well with Ruby's somewhat more reserved but determined self. They could bond over their shared goal of protecting their friends and worlds. Another great pairing could be Sasuke and Weiss. Sasuke's cool and brooding demeanor against Weiss' ice - cold exterior would make for some intense interactions. They could also learn from each other's combat styles. And then there's Kakashi and Blake. Kakashi's wisdom and experience as a ninja could help Blake with her own inner demons and her fight against the White Fang, while Blake could introduce Kakashi to the concept of the Faunus in the RWBY world.
One interesting concept could be the combination of the unique power systems from both 'Shingeki no Kyojin' and 'Naruto'. For example, how the Titans' abilities might interact with ninja jutsus. Maybe the Survey Corps could use some Naruto - style stealth techniques to approach Titans more effectively. Another concept could be the character crossovers, like Eren Jaeger learning from Naruto about the power of friendship and how it can influence one's will to fight.
Imagine that the Akatsuki somehow gets involved with the Titans. They see the Titans as powerful weapons or something to be experimented on. Naruto and his friends suspect this and follow the Akatsuki through a strange rift which leads them to the world of Shingeki no Kyojin. There, they meet the characters from the other series. Together, they have to stop the Akatsuki's evil plan which involves using the Titans to take over both worlds. The Scouts are initially suspicious of Naruto and his powers but soon come to respect him as they see his skills in action.
Definitely Naruto and Natsu. They are both the main protagonists in their respective series and have a lot of energy and a strong sense of justice. Their interactions would be really fun to read, like when they compete to see who can defeat the most enemies or who has the stronger fire - related power.
Sakura and Anya Stroud could be a great pairing. Sakura, with her medical ninjutsu skills, could collaborate with Anya, who is also intelligent and strategic. They could work together in a medical unit during a big battle between the combined forces of the Naruto and Gears of War universes. Sakura might also be interested in learning about the technology Anya uses for communication and intelligence gathering.
Definitely Naruto and Kamen Rider Decade. Naruto is known for his never - give - up attitude and his strong will to protect his friends and village. Decade, on the other hand, can travel through different worlds. Their pairing would be interesting as Decade could bring Naruto to different Rider worlds, and Naruto could introduce Decade to the world of ninjas. They could learn from each other's fighting styles and outlooks on life.
Hawkeye and Sasuke would make an interesting pair. Hawkeye is an expert archer, and Sasuke is a skilled ninja with his own unique form of ranged attacks. They could have a friendly competition to see who has better aim. And they could also learn from each other's combat styles. Hawkeye could teach Sasuke about modern weaponry and Sasuke could show Hawkeye some of his ninja stealth techniques.
Naruto and Pikachu would be an interesting pairing. Naruto's high energy and Pikachu's feisty nature would make for some great adventures. They could both learn from each other's determination and loyalty to their friends. Another good pairing could be Sasuke and Charizard. Sasuke's brooding and powerful nature would match well with Charizard's strength and proud demeanor.