In a fanfiction, James Potter's little sister could be a seer. This would be a great plot point as it would set her apart from her brother. She might see visions of the future that involve her brother's friends, like Sirius and Remus. At first, they might be skeptical of her, but as her visions prove true, they start to rely on her. She could also have a difficult time dealing with her gift, as it can be overwhelming. And she may have to keep it a secret from most of the wizarding world to avoid unwanted attention and potential danger.
One possible storyline could be that James Potter's little sister is a bit of an outcast in the wizarding world because she doesn't have the same brash and popular personality as James. Maybe she's more into books and research. She could struggle to find her place among the Gryffindors who idolize her brother. Another could be that she has a special power that she's afraid to show because she doesn't want to be compared to James all the time. And she might form an unlikely friendship with someone from a different house, like a Ravenclaw, who helps her explore her own identity away from her brother's shadow.
Perhaps she is the opposite of James in terms of magical abilities. While James is good at Transfiguration and Quidditch - things that gain him popularity, she could be excellent at something more subtle like Herbology or Ancient Runes. This difference could lead to some sibling rivalry at first, but then they come to understand and support each other. For example, when she uses her knowledge of Herbology to help James in a difficult situation during one of his adventures. Also, she might be the one to keep James in line when he gets too carried away with his pranks, adding an interesting dynamic to their relationship.
She might have been lured into a trap by a dark wizard who was after the Potter family. The dark wizard could have used her as a bait to get to James or his parents. Another way could be that she was suffering from a mysterious magical illness that couldn't be cured in time. This would add a sense of helplessness to the situation as everyone around her tried their best but still couldn't save her. It could also be that she got lost in a dangerous magical place like the Forbidden Forest and couldn't find her way out, ultimately meeting her end there.
Well, it could make James more protective of his remaining family and friends. He might become more serious and less carefree, as the loss of a sister is a huge blow. It could also fuel his determination to fight against whatever forces caused her death, like in the wizarding world, it might be dark wizards or some sort of magical curse.
One possible storyline could be the chaos that ensues during the wedding preparations. Maybe the venue has some last - minute issues, like the decorations not being set up correctly or the catering going wrong. Another could be the discovery of a long - lost relative who shows up and brings some unexpected family drama. For example, this relative might have a claim to a family heirloom that was supposed to be part of the wedding.
Well, perhaps in the fanfiction, James Potter's sister has a special gift or ability that James is envious of. This envy turns into bullying as he tries to undermine her confidence in using that gift. For example, if she's really good at Potions and James isn't, he might try to sabotage her Potions experiments. Eventually, his sister could find some allies who help her stand up to James, and through a series of events, James has to face the consequences of his actions and learn to accept his sister for who she is.
One great fanfiction about James Potter's little sister is 'The Potter Sibling Bond' on FanFiction.net. It delves deep into her relationship with James and how she copes with the family legacy. It has a really engaging plot that keeps you hooked from start to finish.
In fanfiction, anything is possible. It could be that there's some sort of time - travel or alternate reality magic involved. Maybe a spell gone wrong that altered the timelines so much that Hermione ended up being James' daughter in this new, fictional version of the story.
She might be a bit intimidated by them at first. Since James' friends are known for their mischief and popularity. But as time goes on, she could become friends with them too. For example, Sirius might take her under his wing like a little sister as well, teaching her some of his prank - pulling tricks.
One common trope is the overprotective James. He's always looking out for his little sister and getting into trouble when someone messes with her. For example, in many fanfics, if someone teases her, James is quick to hex them. Another trope is the sister having a special power that no one else in the family has, like being able to communicate with magical creatures in a unique way.
Another storyline could involve the sister being in a different magical school all this time. When she discovers Harry's situation, she transfers to Hogwarts. She then tries to fit into the Hogwarts environment while also trying to figure out how to use her knowledge from her previous school to aid Harry. She might bring new ideas about magic that are different from what they teach at Hogwarts.
The threat to his friends. James is very loyal to his friends, like Sirius, Remus, and Peter. If they were in danger or if something bad happened to them, it would be understandable for him to cry. For example, if one of them got seriously injured or was in a life - threatening situation, his emotions would be on full display.