One possible story could be that Percy learned to be extremely self - reliant. He might have made friends with stray animals on the streets, like a dog or a cat that became his constant companion. He would have to find food and shelter on his own, perhaps by doing odd jobs for kind - hearted shopkeepers.
In the fanfiction, Percy could have developed unique survival skills. Maybe he became an expert at pickpocketing just to get by, but deep down he has a good heart. As he grows up, he might start to long for a real family and a proper home, which could lead to him getting involved in various adventures where he meets people who change his life.
Well, Percy might have a natural talent for art or music that he discovers while living on the streets. He could use scraps to create beautiful drawings or make music with found objects. His art could be his escape from the harsh reality of the streets. Then, one day, a passer - by who is an artist or a musician notices his talent and offers him a chance to get off the streets and pursue his passion in a more proper setting.
Percy would likely be very independent. He'd trust his own judgment above all else because he has no one else to rely on.
In this fanfiction, Percy might also have to deal with his own sanity. Growing up in Tartarus, the constant threat and the dark, desolate place could be a huge mental strain. He could struggle with nightmares and hallucinations, and part of the plot could be about him overcoming these mental challenges while trying to find a way back to the world above.
There might be a monstrous creature that Percy befriends instead of fighting. This creature could have unique abilities that help Percy survive, like being able to sense danger from afar.
A group of bandits might be the main antagonists. They see Percy as someone they can easily rob or enslave since he is all alone. Percy would then have to use his skills to outwit them.
Hermione could still play a major role. She might be the first person to reach out to Harry when he finally enters the wizarding world. Since Harry grew up alone, he would be very different, and Hermione's inquisitive and helpful nature would be drawn to him. She could help him catch up on all the things he missed out on growing up alone.
Well, one possibility is that Percy has to learn to fend for himself in a harsh world. Maybe he discovers unique powers within himself as he faces various challenges alone. For example, he could learn to hunt and build shelters all by himself, much like a survival story.
One possible plot could be Percy's struggle for survival on the streets. He might have to find food and shelter daily, facing challenges from other street - dwellers or the elements. For example, he could be constantly looking for a warm place to sleep at night during the cold winter months.
One possibility is that Harry's family in this fanfiction has deep roots in France. He could be part of a French wizarding family that has been keeping some big secrets. His growing - up years in France could be filled with learning about these family secrets and how they are connected to the larger wizarding world. He might also get involved in a magical competition that is only held in France among young wizards to prove his worth.
It made him more independent. Having to fend for himself on the streets, he learned to rely on no one but himself.
There's a chance that Percy meets the personification of Tartarus itself. It could be a shadowy, all - powerful being that tries to break Percy's spirit. Percy, being the brave hero he is, would have to resist and find a way to either outwit or overpower this entity in order to continue his journey in Tartarus.