One interesting plotline could be Harry and Cedric teaming up to solve a mystery within Hogwarts that the teachers are oblivious to. They use their combined skills, Harry's courage and Cedric's intelligence, to figure out what's really going on. For example, they might discover a hidden chamber that has been long forgotten and holds a powerful magical artifact. Another could be that they form a study group which then turns into a deep friendship. They help each other with their studies, especially in difficult subjects like Potions and Transfiguration. And finally, they could be united in trying to improve the relations between the different houses in Hogwarts. By being friends, they show that Gryffindors and Hufflepuffs can work together and be allies, rather than just competitors in the Tri - Wizard Tournament.
Well, a plotline could be that Cedric and Harry are friends and they both get involved in a magical adventure outside of Hogwarts. Maybe they are on a quest to find a lost magical creature that is said to have the power to heal any illness. Along the way, they face many challenges like dark wizards who want to capture the creature for their own evil purposes. They also meet some interesting characters from different magical communities. Another plotline could be that they are friends and they are trying to break the stigma between pure - blood and half - blood wizards within Hogwarts. They start a campaign to promote equality and acceptance among all students, which of course, is not without opposition.
One interesting plotline could be them teaming up to solve a mystery within Hogwarts that neither the Gryffindors nor the Slytherins are aware of on their own. For example, a hidden chamber that has secrets about the founders that could change the way the houses interact.
One plotline could be them teaming up to outwit the Slytherins in a series of magical challenges. They use their combined skills, Harry's courage and Neville's knowledge of plants, to create obstacles for the Slytherins in a magical maze competition.
In a fanfiction, Naruto and Hinata as friends could go on a journey to find a rare flower that has the power to heal serious injuries. They encounter various obstacles like dangerous terrains and wild animals. Hinata might use her tracking skills with the Byakugan to find the right path, and Naruto would protect them from any immediate threats. As they travel, they talk about their dreams and fears, deepening their bond of friendship.
There could also be a plotline where Cedric protects Harry from emotional harm. If Harry is feeling down or being ostracized by the other students because of his connection to Voldemort, Cedric could be there for him. He could offer words of comfort, invite Harry to hang out with his friends, and in general, create a positive environment around Harry to protect his mental well - being.
One interesting plotline could be their cooperation in a magical quest outside of Hogwarts. They might use their unique skills to solve a mystery.
One idea could be that they face challenges in the wizarding world due to their unique situation. For example, some traditional wizarding families might not accept a female Harry and her relationship with Cedric, let alone the pregnancy. Another plot could involve how they deal with the upcoming baby's magic potential and the responsibilities that come with it. They might also have to protect the baby from dark forces that see it as a threat or a tool for their own purposes.
One possible plotline could be that Harry discovers new magical abilities related to the concept of death. For example, he might be able to communicate with the spirits of the dead in a more profound way than just using the Resurrection Stone. Another could be that his friendship with 'death' gives him a unique perspective on life and sacrifice, leading him to make different choices in his battles against Voldemort.
A great plotline is when they bond over their difficult family situations. Harry has his issues with the Dursleys and Draco has the pressure from his pure - blood supremacist family. They could find common ground in their struggles against the expectations placed on them. This might lead them to support each other in ways that surprise their classmates and teachers alike, like Draco standing up for Harry against Snape's unfair treatment, or Harry helping Draco break free from his family's dark influence.
A really cool plot could be that Naruto and Kyuubi have to enter the minds of the villagers who once feared Kyuubi. They use their friendship as a tool to show the villagers that Kyuubi is not a mindless monster but a being with feelings and a capacity for good. They work together to change the perception of Kyuubi within the village, which helps to strengthen the bond between the village and Naruto even more.
One possible plotline could be Harry finding a way to break free from the cycle of abuse by relying on his friendships. For example, Hermione and Ron could discover what's going on and use their magic skills and wits to protect Harry. They might create a safe haven for him within Hogwarts, using protective spells and charms.