One way to blend them is through a time - travel plot. Bruce Banner somehow travels back in time to the era of the Marauders in the Harry Potter universe. He meets young Sirius Black or Remus Lupin. Banner's knowledge of science and his modern - day thinking could be fascinating to them. The slash could develop as a strong friendship that has undertones of more. For example, Banner and Lupin could support each other in dealing with their respective 'inner beasts' - the Hulk for Banner and the werewolf for Lupin.
A simple way is to have Bruce Banner be a Muggleborn in the Harry Potter world. This would allow for his character to be integrated into the story more easily. The slash aspect could involve a relationship with Harry Potter himself. They could bond over their shared experiences of feeling different from others. Harry as a wizard with a unique past and Banner as a scientist with a big secret (the Hulk).
To blend them well, consider their personalities. Harry is brave and determined, while Banner is intelligent and somewhat reserved. In a fanfiction, they could meet during a dangerous situation, like a dark wizard attack on a Muggle area. Banner might accidentally get involved and use his scientific skills to help, which catches Harry's attention. As for the slash part, their growing respect for each other could turn into a deeper emotional connection as they continue to face challenges together and learn more about each other's worlds.
One interesting concept could be a crossover where the magic of the Harry Potter world interacts with Bruce Banner's scientific knowledge. Maybe Banner could be intrigued by the potions in the wizarding world and try to analyze them with his scientific mind. Another concept might be a situation where the Hulk's strength is pitted against the powerful magic spells of Harry Potter characters.
A good way is to focus on their shared traits. Both Harry and Daryl are survivors. Harry has survived Voldemort's attacks and Daryl has survived the zombie apocalypse. So, in fanfiction, they can bond over their experiences of facing tough odds. For instance, they could exchange stories of loss and how they overcame it.
Well, you can start by finding common traits. Both are young leaders in their own ways. Harry leads his friends at Hogwarts in their battles against Voldemort, and Ciel leads his servants in his fight against those who wronged him. So, a story could be built around them sharing leadership strategies.
In fanfiction, Bruce Banner could save Harry Potter through his scientific knowledge as well as the Hulk's powers. Maybe there's a situation where a magical curse is spreading uncontrollably. Bruce, in his normal state, could analyze the curse using his scientific expertise and figure out a way to stop it. And if there are any physical manifestations of the curse that need to be dealt with, the Hulk could step in and use his strength to destroy or contain them. This would show a great combination of the scientific and magical elements in the story.
First, you need to decide on the basic plot. Will it be a story where they meet in one of their worlds, or will it be a new world entirely? Then, think about how their personalities will interact. Bruce is a brilliant scientist with a temper problem, while Harry is a brave and determined wizard. You can create interesting scenes based on their different skills and mindsets. For instance, Bruce could use his scientific knowledge to analyze a magical phenomenon, and Harry could use magic to protect Bruce from danger.
Perhaps Bruce Banner adopts Harry Potter after the events at Hogwarts. He takes Harry to the world of science, showing him things like advanced laboratories and scientific research. Harry, in turn, shows Bruce the wonders of magic. Their bond grows as they learn from each other, and together they face new threats that combine elements of both the magical and scientific worlds.
Harry is brave and determined. Bruce is intelligent but often hesitant due to his fear of the Hulk. Harry might encourage Bruce to be more confident. He could say things like 'You have so much power within you, don't be afraid to use it for good.'
Fem Harry Potter might be initially cautious around Bruce Banner, especially if she witnesses his transformation into the Hulk. She could use her magic to try and calm him down when he's in a Hulk - rage. Bruce, on the other hand, would be fascinated by Harry's magic. He might study it scientifically, trying to understand the principles behind it.
Another way is through character development. A character in Harry Potter, say Neville, could go on a journey to master a bankai - like power. This could involve him training in a special place, like the Room of Requirement, which could transform into a training ground similar to the ones in 'Bleach' for bankai training. He would face challenges and grow as a character, all while blending the two concepts.
I really liked a fanfic where fem Harry Potter accidentally travels to Bruce Banner's world. It shows how she tries to adapt to this new world full of science and technology, which is so different from the magical world she's used to. And Bruce Banner is intrigued by her magic. It's a great exploration of two very different characters coming together.