Well, one idea could be how Eda's friends support her during the pregnancy. They might help with getting supplies, like magic items for the baby. Another could be Eda's own fears and hopes about becoming a mother, especially considering her wild and free - spirited nature.
The story may also develop by showing Eda's struggles with her daily life while pregnant. Like she might have trouble flying or using her magic as effectively. And it could involve her making preparations for the baby, such as finding a safe place to raise it in the Boiling Isles.
Another storyline might be that Luz has to deal with the expectations that come with being Eda's daughter. Since Eda is a well - known and powerful witch, people in the Boiling Isles might have high hopes for Luz. This could cause Luz to feel pressured, but with Eda's support and guidance, she learns to be her own person and make her own mark in the magical world.
If Luz was Eda's daughter, her relationship with King would be more like that of siblings. King might be a bit more protective of Luz or jealous when she gets more attention from Eda at times. And Luz would probably be more bossy towards King in a sisterly way.
Maybe he starts to train with one - armed techniques. He could learn from other one - armed ninjas if there are any in the fanfiction world. His friends would also play a big role. They might encourage him to keep going or help him in his training.
Well, without having read the 'harry loses crystal arm fanfic', it's hard to say precisely. But it might involve a story where Harry has this unique crystal arm, perhaps it was a gift or the result of some kind of experiment. Losing it could be a central event that sets off a chain of other events. It could lead to him on a quest to get it back, or it could make him face some inner demons as he has to adjust to life without this special part of himself.
It could be a new and powerful rogue ninja who manages to overpower Naruto and cause him to lose his arm. Maybe this antagonist has some sort of vendetta against Naruto or the Hidden Leaf village.
Well, in some 'naruto loses arm fanfiction', it might be a result of a forbidden jutsu gone wrong. Naruto might be exploring a new and dangerous form of power, and the price is his arm. This would then set off a chain of events where he has to find a way to either get his arm back or adapt. He could also face discrimination from some in the ninja community who see him as weakened, but he'd prove them wrong by his unwavering spirit.
One possible plot could be Naruto losing his arm during a battle with a powerful new enemy. He then has to struggle with not only the physical loss but also the emotional and mental toll it takes on him as a ninja. He might have to learn new fighting techniques that don't rely on two arms.