There could be some zoo keepers in the fanfiction. They might be amazed or even a bit frightened when they see Harry talking to the snakes. And who knows, maybe some other Parselmouths from the wizarding world could make an appearance. They might be there to either help Harry or cause trouble for him. For instance, a former Death Eater who is also a Parselmouth could show up to try and capture Harry for Voldemort.
Obviously, Harry Potter himself. He's the main character and the one who can talk to snakes. Hermione might also show up. She's always curious about new things and would probably be interested in Harry's snake - talking adventure at the zoo. Ron could be there too, perhaps being a bit scared of the snakes at first but still supporting Harry.
Maybe Harry discovers a new type of snake with magical abilities. For example, it could be a snake that can turn invisible at will. This would be really cool as it could add a new dimension to the wizarding world's magical creatures.
Ron could also be a main character. He might be a bit scared or jealous of Harry's new - found ability. But in the end, he stands by Harry. Maybe there's a scene where Ron has to overcome his fear of snakes when they are in a dangerous situation that requires Harry to talk to a snake for help.
Harry is the central figure for sure. Neville Longbottom could play a role. He might be one of the few who know where Harry is hiding and is trying to protect the trunk from being discovered. Hagrid could also be involved. He might bring Harry some food and supplies while he's in the trunk. And there could be some mysterious old wizard or witch who has some connection to the trunk and its magic.
Obviously, Harry Potter himself is the main character. His friends like Hermione and Ron are likely to be there. Hermione might offer her intellectual support and advice on raising the child. Ron could be there for some comical relief and also to provide a male friend's perspective. Harry's godson Teddy Lupin could also be an important character, as he might be someone Harry looks to for inspiration on raising a child without a traditional family setup.
Obviously, Harry, Hermione, and Ron would be the main characters. Hagrid could also be there, being his large and friendly self, perhaps a bit out of place in the glitzy Vegas environment. Dumbledore might make a cameo appearance, guiding them from afar or sending them some mysterious messages. Neville could tag along too, excited to explore a new place.
Hermione would likely be there. She's Harry's best friend and would not let him be in juvie alone. She'd probably be trying to find a way to get him out legally, researching all the laws and loopholes. Ron might also show up, being another one of Harry's closest friends. He could be the more impulsive one, thinking about breaking Harry out rather than going through the proper channels. Dumbledore might also be involved in some way. He has always been a guiding figure for Harry, so he could be working behind the scenes to ensure Harry's safety and find a way to clear his name.
There could be some antagonists as well. Maybe some dark wizards who were enemies of the Potter family in the past and are still lurking around the house, trying to stop Harry from taking full control. There might also be some Ministry of Magic officials who are interested in the House of Potter for various reasons, such as the possible presence of powerful magic items. And Neville Longbottom could also be involved, as he was a key figure in the fight against Voldemort and could be there to support Harry in this new adventure.
There would also be other characters like Neville. Harry might talk about how Neville grew from a shy and clumsy boy to a brave hero. Luna Lovegood could be in it too. Harry could share his experiences with her, like their time together in the Department of Mysteries. And characters like the Weasley family members, especially Ginny, who became an important part of Harry's life, would also be likely to be mentioned.
One interesting scenario could be Harry using his snake - talking ability to communicate with a magical snake that guards a hidden treasure. The snake could lead him through a series of enchanted tunnels filled with various magical traps.
Hermione would likely be one of the characters. She's Harry's best friend and would probably try to find him and help him out. Ron might also be there, as he's always been by Harry's side. Dumbledore could be another character. He might be trying to keep an eye on Harry from afar, or perhaps he has a plan for Harry's new situation. Hagrid would also be a likely character. He has a soft spot for Harry and would want to make sure he's okay. And of course, the Dursleys themselves might make appearances, either to continue their mean - spirited ways or to have a change of heart.