Well, in some 'Harry is Dean's son fanfiction', a cool plotline could be his discovery of magic. Since Dean is a half - blood wizard, Harry might have a different experience learning about magic at home. He could be more exposed to the wizarding world's cultural aspects earlier. Also, his friendships might form in a unique way. For example, he could be closer to the Gryffindor students from the start because of his father's house.
In this type of fanfiction, an interesting plotline might involve Harry's family history on his father's side. Maybe there are secrets or a special lineage related to Dean's family that Harry uncovers as he grows up. This could lead to new adventures and challenges. His relationship with his father, Dean, could also be explored in depth, showing how Dean raises Harry, the lessons he imparts, and how their bond affects Harry's journey at Hogwarts and in the wizarding world.
One possible plotline could be Harry struggling to come to terms with his unique parentage. He might face discrimination or fear from others in the wizarding world who don't understand. Another could be his relationship with Death. Maybe Death has certain tasks or lessons for Harry that he must fulfill or learn. And also, his friends' reactions to this revelation would be interesting. Hermione might be eager to research about it while Ron could be a bit more skeptical at first.
One possible plotline could be Harry going on hunts with Sam and Dean. She might use her own unique skills, perhaps some magic - like in the Harry Potter world - to help them out in a way that surprises the brothers. Another could be her trying to fit into their world of hunting while also dealing with the typical sibling rivalries and protectiveness.
One interesting plotline could be Harry's struggle with his new identity. Since Hades is the god of the underworld, Harry might face discrimination or fear from others in the magical world. He could also have unique powers related to death and the underworld, like being able to communicate with the dead more easily. Another plotline could involve his relationship with his father Hades. Hades might try to groom Harry to take over some of his underworld duties, while Harry is conflicted because he also has a life in the wizarding world he doesn't want to abandon.
One possible plotline could be how Harry, as the son of Deadpool, inherits his father's unorthodox combat style and uses it in the wizarding world. For example, he might combine magic with Deadpool's acrobatic and unpredictable fighting moves.
One possible plotline could be Harry exploring his newfound connection to Thanatos. Maybe he discovers powers related to death and the afterlife that are unique to being the son of Thanatos. For example, he might be able to communicate with the dead in a more profound way than using a Resurrection Stone.
One possible plotline could be Harry's struggle with his dual heritage. He has to deal with the wizarding world of Harry Potter and the Norse mythology world of Loki. For example, he might face challenges in learning magic in a way that combines both magical systems. Another plotline could involve his relationships with other characters. Since he is the son of Loki, he might have a more complex and devious side to his personality, which could create interesting dynamics with his friends like Hermione and Ron. They might be initially suspicious of his motives at times.
One possible plotline could be Harry's internal struggle with his heritage. Since Grindelwald was a dark wizard, Harry might battle with the idea of having such a connection. He could face prejudice from the wizarding world while also trying to understand if there are any redeeming qualities in Grindelwald's ideology that might be passed on to him.
One interesting plotline could be how Harry discovers his new 'Son of Fate' identity and the powers that come with it. Maybe he has an even deeper connection to the magical world's origin.
One interesting plotline could be Harry exploring his new powers as the son of Hypnos. Maybe he can use sleep - related magic in unique ways, like putting his enemies into a deep slumber during battles.
Well, in this fanfiction, a great plotline could be Harry's training. Since he's the son of Thor, he might have to undergo special training in Asgardian combat and magic. This could lead to some really cool scenes where he combines his wizarding skills with his Asgardian strength. Also, there could be a plot where he has to prove himself worthy to both the wizarding world and Asgard, which would create a lot of internal and external conflicts for him.