A possible plotline is that Harry finds a sword that can cut through time and space. He uses it to go back in time to prevent certain events that led to the rise of Voldemort. Along the way, he has to battle various enemies using the sword's powers and his own wits.
One interesting plotline could be that Harry discovers an ancient sword with magical properties hidden in Hogwarts. He has to learn how to use it to fight against a new dark wizard threat. Maybe the sword has the power to nullify certain dark spells.
One interesting plotline could be Harry discovers a hidden alchemy book in the Room of Requirement. He then starts to experiment with alchemy to create powerful potions that have unique effects not found in normal magic. For example, he might create a potion that can temporarily give him the ability to understand the language of magical creatures, which helps him in his adventures.
Another plot could involve Daphne Greengrass being a secret admirer of Harry Potter from afar. As the story progresses, she gradually reveals her feelings and they start to bond over their shared experiences of the wizarding world, like dealing with the expectations of their pure - blood families.
Well, one plotline could be the main character, perhaps a new healer at Hogwarts, dealing with magical maladies that are beyond the usual. For example, they might encounter a spell - induced illness that spreads among the students and has to find a unique cure using both traditional and forgotten healing methods.
Perhaps in the fanfic, Harry is turned into a snake for a period of time. As a snake, he experiences the wizarding world from a different perspective. He has to learn how to survive as a snake while still trying to fulfill his role in the fight against Voldemort. He might encounter other snakes that are either friendly or hostile, and he has to use his wits to deal with them.
Since this is an improper concept for the Harry Potter world, there are no so - called 'good' plotlines in such fanfic. We should uphold the positive values that J.K. Rowling intended in the original work, rather than exploring such unseemly fan - created ideas.
Well, perhaps in 'the king harry potter fanfic', there's a plotline where Harry discovers a long - lost magical artifact that gives him the power and status of a king. This could lead to him having to face off against old enemies who now see him as an even greater threat. And his friends from Hogwarts might have to band together to protect him as he adjusts to this new role. Also, it could involve new magical creatures being drawn to him because of his new - found king - like aura.
A great plotline in some fanfics is the discovery of new spells and magic. It could be that a long - lost spellbook is found, and the characters start to experiment with spells that are more powerful and dangerous than what they are used to. This could lead to all sorts of situations, from accidentally creating new magical disasters to using these spells to fight off new, unexpected enemies.
One interesting plotline could be Voldemort being redeemed. It's a really different take as in the original books he's pure evil. But in fanfic, some writers explore what if he had a change of heart.
A possible plotline is that Naruto's Mokuton powers are tied to his emotions. When he's angry, the Mokuton grows out of control, and he has to learn to master his emotions to fully control this powerful ability. This creates a lot of internal conflict for him as well as external challenges when others fear his power.
Another plotline might involve Ruby having to control her newfound magic abilities. Since she already has her scythe skills, adding magic could be a challenge. She might accidentally cause chaos at Beacon Academy while trying to master it, like turning the training grounds into a magical wonderland or making Grimm attracted to the strange magical energy she emits.