One character that would be really cool to include is Edward Elric from Fullmetal Alchemist. His knowledge of alchemy and his quest for the Philosopher's Stone could cross paths with Naruto's search for power to protect his village. Also, Saitama from One - Punch Man. It would be hilarious to see Saitama's nonchalant attitude towards fighting in the world of Naruto, where battles are usually more intense and drawn - out.
Inuyasha could be a great addition. His swordsmanship and half - demon powers could interact in an interesting way with Naruto's ninjutsu. And then there's Mikasa Ackerman from Attack on Titan. Her combat skills and loyalty could make for some great storylines, especially if she teams up with Naruto to defend against a common threat in this crossover world.
Well, one possible plot could be Naruto finding himself in the world of One Piece. He teams up with Luffy to fight against a common enemy that is using the powers of both the Akatsuki and the Marines. They would combine their unique abilities, like Naruto's Rasengan and Luffy's Gum - Gum Pistol, to take on this powerful foe.
Definitely Orochimaru. He is always after power and knowledge. In a gamer crossover, he would be the one trying to hack the game system or find some loopholes to gain an unfair advantage. And Hinata. Her shy but strong - willed nature could be really interesting in a game setting. Maybe she discovers some hidden powers within herself through the game mechanics that she was too shy to explore in the normal Naruto world.
Sasuke is a great character to include. His cool and brooding personality can create interesting dynamics in crossovers. For example, if he crosses over into the world of Attack on Titan, his skills as a ninja would be put to the test against the Titans. Another interesting character is Kakashi. His laid - back yet highly skilled nature can add humor and action to crossovers. He could be a great addition in a crossover with the world of Inuyasha, sharing his knowledge of combat and jutsu.
Since it's a crossover, Naruto is likely to be one of the main characters. But depending on what it's crossed with, there could be other main characters from the other universes too. For example, if it's crossed with Harry Potter, Harry Potter could also be a main character.
Harry Potter would also be a great addition. His knowledge of magic could be combined with the digital world of Summer Wars. He could use spells to protect the virtual world or help the characters understand new magical elements that might appear in the crossover. His loyalty to his friends and his courage would also be traits that would fit well with the Summer Wars characters.
A character like Alice from 'Alice in Wonderland' could be really interesting. She's used to strange and magical worlds, so she could interact with the Invisibles in a unique way. Maybe she could help Arthur navigate some of the more confusing aspects of the Invisibles' world with her own experiences in Wonderland.
One interesting character to include could be a brave knight from a medieval - themed world. The contrast between the knight's chivalry and Ratbag's cowardice would create great tension and comedic moments. Another could be a magical wizard who constantly tries to force Ratbag to face his fears through various spells and challenges. Also, a sly thief from another world could team up with Ratbag, and together they get into all sorts of misadventures while the thief tries to teach Ratbag some of his more devious skills.
In a crossover with the Dragon Ball universe, Goku would be an interesting addition. His Saiyan power and love for fighting would make for an exciting presence during the Chunin Exams. Another character could be Alucard from Hellsing. His vampire abilities would be a strange and powerful element in the ninja - filled Chunin Exams. Also, Edward Elric from Fullmetal Alchemist could be included. His alchemical skills would contrast with the ninja techniques.
Lara Croft from the 'Tomb Raider' series would be a great character to include. She's an expert adventurer and archaeologist. She could help the Men in Black uncover ancient alien artifacts or secrets that are related to current alien threats. Also, Hermione Granger from the 'Harry Potter' series. Her intelligence and knowledge of magic could be applied in unexpected ways in the world of the Men in Black. For example, she could use spells to help in situations where the Men in Black's technology fails.
One interesting character could be a powerful mage from the world Yuri crosses into. This mage could initially be wary of Yuri but then come to respect his skills. Another could be a godlike being who is a trickster. This character would constantly test Yuri and create humorous and challenging situations for him. And also, a young apprentice in this new world who looks up to Yuri and wants to learn from him.