Well, perhaps the fanfiction could focus on Harry's internal struggle with being the Master of Death. He might feel isolated as no one truly understands the power he holds. So, he embarks on a journey to find others who have had similar experiences in the past. Along the way, he discovers secrets about the founders of Hogwarts and how they were also connected to the concept of the Master of Death in ways not previously known.
In a 'Harry Potter Master of Death ROTG fanfiction', the plot could center around the idea that Harry's mastery of death gives him the ability to traverse different realms, including that of ROTG. He could be on a quest to find a way to permanently defeat death in all worlds. Along the way, he meets the characters from ROTG and they form an unlikely alliance. Together, they face challenges that test their abilities and the strength of their newfound friendship.
One possible plot for this fanfiction could be that the DC universe is facing an otherworldly threat that has something to do with death and the afterlife. Harry Potter, as the master of death, is drawn into this situation. He has to navigate the complex politics and powers in the DC world while also dealing with his own powers related to death. He might meet characters like Batman, who is initially skeptical of his magic but then comes to respect his abilities as they work together to save both worlds.
In a 'Harry Potter Master of Death Pokemon' fanfiction, Harry could use his status as the Master of Death to access a hidden realm in the Pokemon universe where Pokemon that have passed away exist in a different form. He might learn that there are certain Pokemon that hold the key to restoring balance between life and death in both worlds. With his magical abilities and new - found knowledge of the Pokemon world, he embarks on a journey to find these Pokemon and prevent a cataclysmic event that would disrupt the fabric of both universes.
One possible plot could be that Harry, as the master of death, accidentally gets transported to the Star Wars universe. He then uses his magic skills to help the Jedi in their fight against the Sith. He might introduce the concept of the Deathly Hallows to them, which could change their understanding of life and death.
It could be a dark wizard who wants to steal Harry's power of being the Master of Death. This wizard might believe that with that power, they can rule the wizarding world without any opposition. He could be an ancient dark wizard who has been in hiding for centuries and now sees Harry as the key to ultimate power.
One possible plot could be that Harry Potter, being the Master of Death, somehow finds his way into the Marvel universe. Dr. Strange, sensing this strange and powerful presence, seeks out Harry. They initially clash due to their different magical understandings. But then they realize they can learn from each other. Harry could teach Dr. Strange about the true nature of death and how to face it without fear, while Dr. Strange could show Harry more advanced spell - casting techniques in a different magical system.
A new character created specifically for the fanfiction could also be the Master of Death. This character could be a hybrid of a wizard and a vampire or werewolf, having the combined knowledge and abilities of both worlds. They could use their power to try and create a new order where wizards, vampires, and werewolves co - exist peacefully, using their mastery over death to enforce certain rules.
Well, perhaps Harry could be trained in dark arts skills that are not typically taught at Hogwarts. He might learn to communicate with the dead in a more profound way and gain unique powers to combat Voldemort.
It might involve the Deathly Hallows taking on new significance in relation to the Endless Death. For example, the Elder Wand could be seen as a tool that even Death from the Endless might be interested in. The Resurrection Stone could have a connection to bringing back those who have passed on in a way that goes beyond the normal magic in Harry Potter, influenced by the nature of Death in the other fictional context.
Well, it could be about a character who has an unusual fascination with death in the Harry Potter universe. Maybe they study dark magic related to death more closely than others. For example, they might be exploring the secrets of the Deathly Hallows in a very different way than what we see in the original books.