Charlie, Bella's father, would also be a very likely helper. He's her family and has a natural instinct to protect her. He would be worried sick about his daughter and would do everything in his power to make sure she gets better, whether it's taking her to the doctor, making her favorite meals, or just sitting with her to keep her company.
Alice might be the one to help Bella. Alice is very perceptive and has visions of the future. She could foresee any complications in Bella's sickness and take steps to prevent them. Also, she's a caring friend and would be right by Bella's side, making sure she's comfortable and getting the right treatment.
There might be a kind - hearted doctor in the 'baby bella gets sick fanfiction'. The doctor would examine Baby Bella carefully, give accurate diagnoses and prescribe the right medicine. Also, her best friend could be a character. Her friend might visit her often and bring her favorite toys or books to make her hospital stay or time of being sick at home more bearable.
It could also be Embry. He's a bit of an outsider in the pack in some ways, and imprinting on Bella could give him a sense of purpose and belonging that he may have been lacking. His relationship with Bella could start out as a surprise to both of them but then grow into something that has a big impact on the dynamics of the pack and Bella's life.
Castle would be the most likely. He has always been by her side, and his love for her would drive him to do everything he can to help her recover. He could use his resources, like his wealth and connections, to get her the best medical treatment. And he would also be there emotionally, constantly cheering her up and giving her the motivation to get better.
Her best friend could be the first one to help. They might notice the signs of malnourishment like her pale skin and lack of energy. They start by sharing their lunches with her at school.
Well, Naruto for sure. His friends from Team 7 are highly likely to be in it. But also, characters like Tsunade. As the Hokage and a great medical ninja, she could be consulted if Naruto's illness is really serious. Jiraiya might also make an appearance in Naruto's sick day fanfiction, perhaps reminiscing about his own times when he was sick as a young ninja.
First off, Edward is likely to be deeply affected. He has spent so much time and energy trying to protect Bella and keep her safe. Now, with her humanity off, he may feel like he has failed. Jacob, too, will be affected. His feelings for Bella, whether it's love or friendship, will be challenged. Also, Bella's father would be affected. He has always cared for his daughter, and seeing her change so drastically would be heart - breaking for him.
Juvia. Although she is extremely loyal to Gray and Fairy Tail in the original series, in a fanfiction, if she were to misinterpret Gray's actions or words as a rejection of her love, she could become desperate. An enemy could take advantage of her vulnerability and persuade her that Fairy Tail is the reason for her unhappiness. Then she might turn against the guild.
Neville Longbottom could be a likely candidate. He has shown great courage and has been through a lot. If the situation was dire enough, Harry might train him to be a more effective fighter, bordering on a killer, to protect Hogwarts and the wizarding world.
Iruka - sensei would be very likely to help. He was Naruto's first teacher and has always cared about him. He could use his teaching skills to reteach Naruto things he's forgotten. Hinata would also be there for Naruto. Her love for Naruto is strong, and she would do anything to help him. She might use her Byakugan to look for any physical problems in Naruto's body that could be related to his memory loss. And of course, Jiraiya. If he were still alive in the fanfiction, he'd be a great help. He trained Naruto and knows him well, so he could use his sage knowledge to assist in getting Naruto's memory back.
Some dark wizards or witches who oppose the new order at Hogwarts after the fall of Voldemort could also be the villains. They might see Hermione as a threat to their plans of taking over or causing chaos in the wizarding world. They could force her to do things against her will in order to gain an advantage over the good side.