Naruto might be super excited. He loves making new friends, and a toddler would be like a new little friend to him. He'd probably start showing off his ninja moves to make the toddler laugh.
Naruto would feel a sense of responsibility. He might think that it's his duty to do something about it. He could start by examining the chains to see if there is any way to break them. He would also be on high alert because he doesn't know if this is some sort of trap. He would be thinking about all the possible consequences of his actions and how it could affect the world around him.
He might be quite shocked at first. After all, Wolfstar involves his dad's best friend Sirius and his other dad figure Lupin. It's a rather strange concept for him to think about them in a romantic way as he knew them in a different context.
In some fanfictions, Snape might be secretly sympathetic. He may see the scars as a reminder of all Harry has been through, which could soften his usually harsh attitude towards Harry, at least for a moment.
He might be really surprised. In alternate universe fanfiction, things could be so different from his own world. For example, he could see versions of himself with different powers or relationships. It would be like looking into a strange mirror that shows a distorted but fascinating view of his life.
He might be really surprised. Some fanfictions could show him in situations he never thought of, like different kinds of friendships or battles. He'd probably be curious about how fans see him and his world.
He would probably be very displeased. Snape has always been strict and traditional, and fanfiction about the DA, which was an unauthorized student group in his eyes, would seem like a frivolous and inappropriate thing to him.
Well, Percy has seen a lot in his adventures. At first, he might be a bit taken aback because fanfiction is a whole new world compared to his real experiences. However, as he realizes that it's just fans exploring different scenarios with the characters, he could become rather indifferent. He might even start to see the value in it, as it shows how much the fans care about the overall story and its characters. He might think it's a little strange that people are so interested in writing about Nico and Will's relationship, but he'd respect the creativity of the fans.
In such a fanfiction, Naruto might take on a protective role. He could use his ninja skills to keep the toddler safe from any potential threats in the Naruto world, like rogue ninjas or dangerous beasts.
Well, he could either find it hilarious or a bit offensive, depending on what the fanfiction is about. If it's a comical take on his story, he might laugh his head off. But if it distorts his relationships or his character in a negative way, he might not be too happy. For example, if someone writes a fanfic where he's a coward, which is completely against his real personality, he would likely be annoyed.
He might be really surprised. Some fanfictions could have really out - of - the - box ideas that he'd never thought of. For example, if there's a fanfiction about him having a different kind of training with a new teacher, he'd be like 'Whoa, that's a new take on things.'