Hermione could be one of the characters to help Harry. She's intelligent and resourceful, so she could provide practical help like finding a good doctor or helping with magic - related pregnancy issues if it's in a magical world. Another could be Hagrid. He has a big heart and could offer emotional support and perhaps a place for Harry to stay if he needs it.
The plot might involve Harry trying to figure out how he got pregnant in the first place if it's in a world where male pregnancy is not the norm. He could be alone because he doesn't want to burden his friends or family. Harry would then have to learn about pregnancy on his own, from reading books or searching the internet. He might also face financial difficulties as he prepares for the baby's arrival, but through his own determination and some unexpected help, he starts to build a new life for himself and the baby.
One common plot is the mystery of the father. In many such fanfictions, the identity of the baby's father is not immediately clear. This adds an element of suspense and intrigue. For instance, it could be a character who has been secretly in love with Hermione or someone she had a one - time encounter with.
It could be that in the fanfiction world, Hermione was the victim of a spell gone wrong. This spell could have made her pregnant and also somehow cut her off from her usual support system, leaving her alone. Or perhaps she made a choice to distance herself from others because she didn't want to endanger them while she was dealing with this unexpected pregnancy.
Loneliness and isolation are big themes. These fanfics often explore how Harry feels being alone, the emotional turmoil he goes through. Also, the theme of inner strength is present. Harry has to dig deep within himself to find the strength to face whatever comes his way while alone.
Hermione could still be a common character. Even in fanfiction where Harry is alone, Hermione might be mentioned in his thoughts or in flashbacks as someone who has influenced him. For example, he might recall her advice on how to study magic when he is facing a difficult spell alone.
Well, in some cases, there could be minor characters from the original series who still interact with Harry on a limited basis. For example, Neville Longbottom might make an appearance. Even though Harry is alone for the most part, Neville could cross paths with him and have a brief conversation or exchange that has an impact on Harry's journey.
One possible storyline could be that Artemis tries to hide her pregnancy while still fulfilling her duties. She might face challenges like dealing with her own changing body and the risk of being discovered. Another could be that she searches for the father in secret, all while feeling alone and scared.
A likely theme would be survival. Pregnant and alone, Bilbo would have to find ways to ensure her own and her unborn child's survival. There could also be a theme of motherhood. Even in this unique and perhaps difficult situation, she would be preparing for motherhood. And perhaps there could be a theme of hope, as she looks forward to the future with her child despite the current hardships.