Perhaps an older teacher or coach who has always had an eye on Kuroko's potential could step in as a savior. They could see the signs of bullying and use their authority to punish the bullies and provide support and guidance to Kuroko, helping him to grow stronger both on and off the court.
A new student in the school could be the one to save Sakura. This new student might have had similar experiences in their previous school and decides to take a stand against the bullies when they see Sakura being harassed.
It could be some of the more aggressive monster characters. For example, the dog monsters might be territorial and see Frisk as an intruder, so they bully Frisk.
Lisbon could be a top contender as a savior. She knows Jane very well and is highly motivated to rescue him. Her detective skills and knowledge of Jane's habits would be very useful in tracking him down. Another could be Cho. He's very resourceful and has a calm head under pressure, which would be great for handling the situation.
Hermione could be a potential savior. She's smart and resourceful. She might figure out where Lockhart has taken Harry by using her vast knowledge of magic and Hogwarts' secrets.
One potential ally could be a new student at school. This new kid might see what Romano is going through and decide to be his friend and stand up to the bullies. Another could be a teacher who finally notices the bullying and takes Romano's side.
His friends from Camp Half - Blood, like Annabeth, Grover, and Tyson, could be the potential saviors. They have always been by his side and would do anything to rescue him.
Dumbledore could be a savior in this fanfiction. He has the power and the wisdom to step in and help Harry. He might have been waiting for the right moment to remove Harry from the Dursleys' influence. Also, there could be a new character, like an old and powerful wizard who has been in hiding but senses Harry's distress and comes to his aid. This wizard could have some unique magical abilities that can protect Harry and help him grow into a powerful wizard himself.
A wandering samurai could be his savior. This samurai, having a strong sense of justice, stumbles upon the baby Naruto. He takes Naruto under his wing and teaches him swordsmanship and a different code of honor. Naruto grows up with a unique set of skills and a different perspective on life compared to if he had been raised in the village.
Harry and Ron are the most obvious choices. They've always been there for Hermione in the original series, so it would make sense for them to be the ones to find her and try to save her life. They would use their combined magical skills and knowledge to fight off any remaining threats and get her to safety.
One possible plot could be that Kuroko's quiet and unassuming nature makes him an easy target for a group of jealous basketball players. They might try to undermine his confidence before a big game by stealing his training equipment or spreading false rumors about him.