In some 'Luffy raised by Dragon fanfiction', a plotline could be that Luffy inherits some sort of special power or mission from Dragon. This power could be related to the revolutionary cause. As a result, Luffy has to balance his dream of becoming the Pirate King with this newfound responsibility. And he might encounter more complex enemies who are not just pirates but also related to the oppressive world government that Dragon is fighting against.
Well, a plotline might involve Luffy being trained in stealth and strategic planning by Dragon. This would add a new dimension to his character as he usually just charges head - first. Also, there could be a story where Luffy has to keep his relationship with Dragon a secret from his crew at first, and the internal struggle he faces about that.
One interesting plotline could be Luffy making new and strange alliances in the New World. For example, he might team up with a race of sea - dwelling creatures that have unique abilities.
One possible plotline could be Natsu developing unique magical abilities different from his canon ones due to being raised by another dragon. Maybe he has a different way of controlling fire or even some new elemental powers.
One possible plotline could be that Luffy discovers a magical sword that gives him new abilities. For example, it might allow him to cut through any material, even things that his normal attacks can't touch. This would change the dynamic of his battles and how he approaches enemies.
Another interesting plotline could be related to the prophecy or some sort of hidden danger that only Shanks is aware of. He saves Luffy not just from an immediate threat but from a long - term danger that could have ended Luffy's journey towards becoming the Pirate King. Shanks might have to sacrifice something of his own in the process, like his position or a precious item, to ensure Luffy's safety.
Perhaps there could be a plot where Luffy, as a girl, has to use different strategies in battles. Since the opponents might underestimate a female opponent, Luffy could use this to her advantage and surprise them with her strength. This would also show a different side of Luffy's combat intelligence.
A great plotline might involve the crew getting lost in a mysterious and dangerous part of the Grand Line. They have to rely on each other more than ever and discover hidden secrets about the world and themselves. Maybe they find an island that has been forgotten by time, with technology or magic that is completely different from what they've seen before. And of course, there could be a lot of character - development moments for all the crew members during this adventure.
One interesting plotline could be how Harry's personality is shaped differently. With the Marauders' influence, he might be more mischievous and confident. For example, he could learn pranks from them at a very young age and use them to outwit his enemies later on.
A third plotline might be Percy's newfound powers or abilities due to being raised by the Hunt. He could develop enhanced senses, like better vision at night or a keener sense of smell. This would not only help him in hunting but also in facing off against enemies. He could use these powers to protect the Hunt from threats that they haven't encountered before.
Well, perhaps in this fanfiction, Harry's snake -raising has given him some special powers related to serpents. For example, he could have the ability to move as silently as a snake or even use some snake -like magic that others don't possess. Also, the story could explore how his relationship with the snakes affects his relationships with his human friends. Maybe at first they're a bit put off, but later come to understand and accept this part of him.
In this fanfiction, a likely plotline could be Bella's struggle with her identity. Being raised by the Volturi, she's in a very different environment from the one she knew with the Cullens. She may have to adapt to the Volturi's strict rules and hierarchy. There could be a conflict within her as she tries to hold on to her human values while also becoming part of the Volturi world. This inner struggle could drive the story forward as she tries to find her place in this new and often menacing vampire society.