Well, X himself would likely interact with Lincoln. Lincoln is often at the center of things in the Loud House, and he would probably be the one to first encounter X if he showed up. They could bond over their sense of justice and protecting their respective worlds.
I think Lucy would also be a likely character to interact with Megaman X. Given her gothic nature, she might be intrigued by X's robotic and somewhat otherworldly presence. She could perhaps help X understand the more mysterious aspects of the Loud House, like the old legends and spooky places in their town.
Definitely Geo Stelar from Megaman Starforce and X from Megaman X. Geo has his own set of skills and X is iconic in his series. They would be the natural leaders to start interactions between the two groups.
Luna could also be a great character to interact with Casper. Given her love for all things cool and different, she would probably be really excited to meet a friendly ghost. She might even write a song about their encounter.
Obviously, the Loud family members would be the main characters. Lincoln, being the main character in the original series, would probably play a crucial role in this fanfiction too. He might be the one to come up with plans to deal with the situation of being left in the dark.
Most likely, the main characters would be the Loud siblings. They are at the center of the 'Loud House' series, so in a fanfiction about changing the baby, they would probably play important roles.
In a fanfiction, the interactions could be really interesting. Cloak and Dagger are used to a world of danger and secrecy. When they meet the Loud family, they bring that sense of mystery with them. The Loud family, being curious, would ask a lot of questions. There could be a scenario where one of the Loud kids gets into trouble in the city, and Cloak and Dagger rescue them. This would start a relationship where the Loud family is in awe of Cloak and Dagger's abilities, and Cloak and Dagger are charmed by the family's warmth and unity. As time goes on, they could start working together on smaller issues in the neighborhood, with the Loud kids using their street - smart knowledge and Cloak and Dagger using their powers.
Obviously, Megaman Starforce and Megaman Rock would be the main characters. They are the ones the title focuses on. Maybe their respective sidekicks or friends could also play important roles, like Geo's friends in Starforce and Rock's allies like Roll.
Well, it could also be Lynn. She has a competitive and determined spirit. In a way, she's like Iron Man in that she's always looking for ways to be the best and win. If she had access to Iron Man - like technology, she'd use it to her advantage in combat and strategy. And she's not afraid to take risks, which is another trait of Iron Man.
Luna might be a bit of a wild card. Her love for rock music and her sometimes rebellious nature could be twisted into the dark side. She might be lured by the power of the Sith, thinking it would make her an even greater rock star in the Star Wars universe. But in the end, her family would probably try to bring her back from the dark side.
One idea could be that Megaman X somehow gets transported to the Loud House world. He could team up with the Loud siblings to fight a new kind of virus that is affecting both the digital world he comes from and the real - world of the Loud House. For example, the virus might be making the electronics in the Loud House go haywire and also infecting some digital creatures that have found their way into the real world.
Obviously, Megaman Star Force and Megaman Rock would be the main characters. They are the key figures from their respective series.