Perhaps in a fanfiction, Dr Doom is actually a distant relative of one of the wizarding families in the Harry Potter universe. He discovers this connection and decides to use it to his advantage. He could try to manipulate the wizarding politics to gain more power, all while Harry Potter and his friends are suspicious of his motives and try to stop him.
The doom in Harry Potter fanfic makes it unique because it adds a sense of impending danger and darkness that's not always present in the original. It can change the tone completely. For example, in regular Harry Potter, there's hope and light, but in doom fanfic, it might be all about survival.
Well, it works by mixing the two distinct universes' elements. For instance, the magic from Harry Potter and the extreme combat scenarios from Doom. The fanfic writers might give Harry Potter the ability to use Doom - like weapons or give Doomguy some magical powers. It creates a really unique and exciting blend.
One interesting Doom Harry Potter fanfiction could be where the dark and gritty atmosphere of Doom seeps into Hogwarts. For example, a story where Harry has to face demons in the Forbidden Forest that are a result of some dark magic gone wrong, similar to the threats in Doom. Another could be about a crossover where Doomguy somehow ends up in the wizarding world and teaches the students some unorthodox ways of combat.
There might be a story where Harry Potter, using some of the power - up items from Doom, battles against Voldemort. For example, he could get the BFG (Big Fucking Gun) in a magical way and use it to take on the Death Eaters. This would be a really wild and action - packed fanfiction.
The themes can be combined by having the sense of impending doom from the Doom game be present in the Harry Potter universe. For instance, the constant threat of the demons in Doom can be equated to the threat of Voldemort and his Death Eaters in Harry Potter.
One possible plotline could be that Harry Potter somehow gets transported to the Marvel universe and, through some strange magic - technology fusion, takes on the characteristics of Doctor Doom. He might start using his newfound powers and knowledge to try and rule Hogwarts in a more tyrannical way, much like Doctor Doom rules Latveria.
One interesting story could be where Doctor Doom somehow gets transported to the Harry Potter universe. Maybe he tries to take over Hogwarts using his advanced technology against the magic of the wizards. He might see the magic as a new form of power to be harnessed for his own ends.
Well, it could start with a magical accident that somehow links Harry Potter's world to Victor von Doom's. Harry, being the hero he is, might initially be mistaken for a threat by Doom. As the story progresses, Harry realizes that Doom's actions are causing chaos in both worlds. He then uses his knowledge of magic and his wits to try and convince Doom to stop. Along the way, there could be battles, both magical and technological, and Harry might even learn some new skills from Doom's world while trying to find a solution to separate the two universes again.
Dr Doom would be a very interesting addition to the Harry Potter universe. His advanced technology would be a stark contrast to the magic of the wizarding world. He might see the magic as something to be conquered or studied. For example, he could try to reverse - engineer spells into technological equivalents.