There is a fanfiction called 'Shadow's Destiny Beyond Black Doom'. It takes the idea that Shadow manages to break free from Black Doom's control completely and then sets out on a journey to reshape his own fate. It's interesting because it gives Shadow a lot of agency and shows his growth as a character.
One great Shadow and Black Doom fanfiction could be 'The Redemption of Shadow'. It shows Shadow's struggle against the influence of Black Doom in a really engaging way. The author does a good job of exploring Shadow's character and his complex relationship with Black Doom.
A popular one is 'The Battle Against Black Doom: Shadow's True Strength'. In this story, Shadow has to face Black Doom in a final showdown. The story is full of action scenes and also delves into the deeper meaning of Shadow's existence and his purpose in fighting against Black Doom. It's really exciting for fans of the Shadow and Black Doom lore.
First, you need to know the characters well. Read up on all the official stories about Shadow and Black Doom. This will give you a good base to start from. For example, understand Shadow's origin and his powers, and also how Black Doom functions as an antagonist. Then, come up with a unique plot idea. Maybe something like Shadow discovers a hidden weakness of Black Doom.
One good Dr Doom story is his rivalry with the Fantastic Four. His constant attempts to defeat them and prove his superiority make for great tales. He is a complex villain with a tragic backstory that adds depth to his character in these stories.
One interesting Naruto black shadow fanfiction could be about a new jutsu related to the black shadow that Naruto discovers during a secret training session. It might give him an edge in battles against powerful foes.
One popular doom crossover fanfiction might be the one where Doomguy crosses over with the Halo universe. It's interesting to see how his brute - force combat style would interact with the high - tech warfare of Halo. Another could be a crossover with the Warhammer 40k universe, with Doomguy facing off against the chaos forces. There's also a crossover with the Metroid series where the desolate and dangerous environments of Doom blend well with Samus's adventures.
One interesting Naruto Doom fanfiction could be one where Naruto gains Doomguy's powers. He might use the superhuman strength and combat skills to take on new and powerful enemies in the Naruto universe. For example, he could use the Doomguy's chainsaw to cut through some of the toughest demons in his world as if they were regular foes.
One great Tempest Shadow fanfiction could be about her backstory before she joined the Storm King. It might explore her early days and what led her to that path.
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.
One interesting story could be where Jasmine finds herself in the Doom world and has to use her wits to survive. Maybe she teams up with the Doom Slayer and they face the demons together. Another could be a more comical take where Jasmine's presence in the Doom universe disrupts the normal order of things in a funny way.
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.
One of the best Doom stories could be about a player who managed to beat the game using only the most basic weapons. It was a real test of skill as they had to strategize and use every bit of the environment to their advantage. They outsmarted demons at every turn, making their way through the levels with pure determination.