Reborn would likely be the one to come up with a long - term plan. He has a lot of knowledge and connections. He might start by looking into who could have a motive to frame Tsuna. And while he's doing that, he'd also be training Tsuna's friends to be better prepared to handle the situation, because he knows that just getting Tsuna out of jail isn't enough. They need to make sure it doesn't happen again and find out who the real enemy is.
Yamamoto would be more level - headed. He would first try to find out the details of Tsuna's arrest. He might talk to the police or other authorities to see if there's been a misunderstanding. He'd also be a source of support for Tsuna's family during this tough time.
In a Tsuna gets arrested fanfiction, it could be that a new enemy discovers a loophole in the law and uses it to have Tsuna arrested. This enemy might be from a rival family or an unknown organization. Tsuna's arrest would then be a way to start a new arc in the story. His friends like Gokudera and Yamamoto would likely be very determined to get him out. They could start their own investigation, and in the process, uncover secrets about the enemy and the legal system in their world. It could also lead to Tsuna making new allies within the prison or among the legal authorities who come to believe in his innocence.
His friends would most likely be very concerned. They would probably bring him things like food and medicine. TK might pray for his quick recovery.
Fishlegs would be really concerned and would use his knowledge to try and help. He might look for herbs or remedies that could aid in Hiccup's recovery. Snotlout, on the other hand, might initially try to act tough but deep down he'd be just as worried. He might try to show off his strength by helping to carry Hiccup or something like that. And Tuffnut and Ruffnut would be their usual chaotic selves, but also very caring towards Hiccup in their own unique way. They could make jokes to try and cheer him up while he's in pain.
Sonic would be devastated. He and Tails are like brothers. Sonic would likely go into a rage and vow to avenge Tails' death. He would immediately start hunting down whoever or whatever was responsible. Amy would be heartbroken as well. She would probably be the one to try to comfort Sonic while also being deeply sad herself. Knuckles would be angry and ready to fight alongside Sonic to seek justice for Tails.
The Glee club members would be shocked. Rachel, for example, would probably be very vocal about her disbelief and start campaigning for Finn's release. She might even organize a benefit concert to raise money for his legal defense.
I think his friends' reactions would be mixed. Kakashi would be that calm and collected presence, giving Naruto some words of wisdom about this new chapter in his life. Hinata might be a bit sad at first because she had feelings for Naruto, but she would also be happy for him. The rest of the Konoha 11 would be excited. They would see it as an opportunity for Naruto to bring about new changes not just in Konoha but in the whole ninja world. They would all gather around to support Naruto and make sure the marriage goes smoothly.
Raven would probably be the first to sense that something was wrong with Beast Boy. She'd be quiet about it at first, but she'd start keeping a closer eye on him. Maybe she'd make him some herbal tea that she believes has healing properties.
I think Naruto's friends would be quite shocked. For the more traditional ninja like Neji (if he were still alive in this fanfic), he would see the gun as an abomination to the ninja way. However, Naruto's closest friends like Kiba would be more open - minded. Kiba might see it as a cool new weapon and want to see what it can do. But overall, they would all be concerned about how Naruto got the gun and what it means for their world of ninjas.
His friends would be extremely worried. They might immediately drop whatever they are doing to rush to his side. For instance, Thomas would be right there, trying to assess the situation and figure out how to help. He would be filled with a sense of urgency and determination to get Minho the care he needs.
Well, Betty will be super worried. She's always had a soft spot for Archie. She might skip her own activities to stay by his side, constantly checking his temperature and making sure he's comfortable. Jughead, on the other hand, will try to keep things light. He'll tell Archie stories about the latest strange things he's seen in Riverdale to distract him from his illness. Veronica will be more of the practical one. She'll call in doctors or specialists, using her family's influence to ensure Archie gets the best care possible. All in all, his friends will rally around him.