Garroth and Boris would be an interesting pairing. Garroth, with his knight - like qualities of loyalty and protection, could befriend Boris, who is often in need of protection in the BatIM world. And then there's Katelyn and Alice Angel. Katelyn's feisty and strong - willed nature against Alice Angel's more complex and somewhat tragic character. They could have some really intense and thought - provoking interactions, especially if they start to understand each other's motives and backgrounds in this strange crossover of two very different fictional universes.
Aphmau from MyStreet and Freddy Fazbear would be an interesting combination. Aphmau is a strong - willed leader in her world, and seeing her face off against Freddy, the iconic animatronic from FNAF, would be exciting. Another interesting pair could be Aaron from MyStreet and Foxy. Aaron is often protective, and Foxy has that unpredictable nature.
Yukari (from Persona 3) and Chie (from Persona 4). Yukari is very outspoken and has a bit of a sarcastic side, while Chie is energetic and a bit of a tomboy. Their different personalities could lead to some really fun and comical interactions, especially when they're facing Shadows together or just hanging out in the school setting.
One idea could be that the characters from Mystreet end up in the world of BatIM. Maybe Aphmau and her friends are trying to find a way back home while being chased by the Ink Demon. Another could be a character from BatIM somehow enters the Mystreet universe and causes chaos among the residents there.
Definitely the Flash and Iron Man. Tony Stark's high - tech gadgets and intelligence combined with the Flash's super - speed would make for some really cool scenes. They could work together on building some sort of super - fast vehicle or weapon. Another interesting pairing would be the Flash and Captain America. Steve Rogers' leadership and combat skills along with the Flash's speed could be a great combination for taking on enemies. The Flash could quickly get Steve into strategic positions during battles.
Another great pairing could be Sasuke and Griffith. They both have a certain level of ambition and a thirst for power. They might start off as rivals, constantly trying to one - up each other in terms of strength and influence. But as they face greater threats together, they could learn to respect each other and even form an uneasy alliance. It would be fascinating to see how their different motives play out when they are forced to work together.
I think Spyro and Kakashi would be an interesting pair. Kakashi is a very experienced and intelligent ninja, and Spyro is a powerful dragon with unique abilities. Kakashi could be intrigued by Spyro's magic and his different combat style. And Spyro could be in awe of Kakashi's Sharingan and his vast knowledge of ninjutsu. Also, Spyro and Sakura could be a good pair. Sakura has grown into a strong kunoichi, and Spyro could help her further develop her combat skills, especially in terms of using her strength in more creative ways.
I think Eleven and Bill would make an interesting pairing. Eleven has her telekinetic powers and has faced otherworldly threats in the Upside Down. Bill is the leader of the Losers' Club and is very brave. Together, they could lead their respective groups in a fight against the combined threats of the Demogorgon and Pennywise.
I think Naruto and Integra would be a fascinating pairing. Integra is a strong and authoritative leader in the Hellsing world, and Naruto has his own leadership qualities within his ninja team. They could have some really interesting discussions about leadership, duty, and protecting their respective worlds. Also, Kakashi and Alucard would be a cool pair. Kakashi is known for his calm and collected nature, and Alucard's unpredictable and powerful presence would create a great dynamic. They could exchange knowledge about combat techniques and strategies from their different worlds.
Naruto and Frisk would be really interesting. Naruto is all about never giving up and has a strong sense of justice, while Frisk is determined in their own way, always choosing the path of peace and kindness in Undertale. Their combined determination could lead to some great adventures and they could learn a lot from each other's ways of dealing with challenges.