A possible plot in this fanfiction could be that the power of the Master of Death attracts the attention of some powerful Asgardian villains. Thor steps in to protect Harry, but they soon realize that they need to work together. Harry's ability to come back from the dead could be a crucial factor in their battles. Also, their different personalities - Harry's more reserved and intellectual approach and Thor's bold and brash nature - would create interesting dynamics in the story.
Well, in such a fanfiction, perhaps Harry Potter, being the Master of Death, has some knowledge or power that Thor needs. For example, if there is a dark force in Asgard that is related to death in some way, Thor might seek Harry's help. Their encounter could lead to a cultural exchange too, with Harry learning about Norse mythology and Thor about the wizarding world.
Harry could use his invisibility cloak to his advantage in Thor's world. He could spy on enemies or gather information without being detected. His ability to communicate with spirits as the Master of Death might also give him an edge. He could perhaps communicate with the souls of fallen Asgardians and learn their secrets.
Maybe the Deathly Hallows have some sort of connection to Asgardian artifacts. Harry, in his role as the Master of Death, starts to investigate this connection and ends up in Thor's world. Thor initially doubts Harry but as they face challenges together, like an army of dark creatures from the wizarding world invading Asgard, they become friends and allies.
It could be about a character from the 'Harry Potter' world, perhaps Harry himself as the master of death, somehow ending up in the 'Inuyasha' universe. Maybe he uses his magic skills and knowledge of death to help Inuyasha and his friends in their battles against demons.
It could be really interesting. Maybe Harry could use his magic skills, like being able to Apparate, in Gotham City. He might team up with Batman to fight against some super - evil villains that are a mix of the magical and non - magical worlds. For example, Voldemort could somehow team up with a Gotham super - criminal, and Harry and Batman would have to combine their wits and powers to stop them.
A great crossover idea might involve Harry sharing his knowledge of death and resurrection with Thor. Thor, having faced death and loss in his own world, could be intrigued. Maybe they could work together to bring back a fallen hero from either of their worlds. Also, the Elder Wand could have some sort of interaction with Thor's hammer. What if the power of the Elder Wand could enhance the abilities of Mjolnir for a short time?
Well, it could be about Harry coming back to life in a new and unexpected way. Maybe he returns with even greater powers, being the Master of Death. He might use his newfound state to fix all the wrongs in the wizarding world, like finally getting rid of all the remaining Death Eaters once and for all.
It could be really interesting. Maybe the Master of Death abilities would allow Harry to survive the dangerous situations in the Stargate universe, like going through the stargates to unknown planets and facing alien threats. He could use his magic along with the technology in the Stargate world.
Well, it could be that Harry has complete control over death. He might be able to bring back the dead, or at least communicate with them freely. Maybe he uses this power to right the wrongs of the wizarding world, like resurrecting those who died unjustly during the war. He could also use it to gain ultimate knowledge, as death is often associated with hidden secrets in the wizarding lore.
In such a fanfiction, we might see Harry Potter's magic blend with the spiritual energy of 'Bleach'. The Deathly Hallows could have new interpretations in the 'Bleach' setting. For instance, the Invisibility Cloak could be seen as a form of spiritual concealment. And his mastery over death might make him a sort of enigma to the characters in 'Bleach'. He could also learn about the different levels of souls in 'Bleach' and how they compare to the concept of death in 'Harry Potter'.
One possible fanfiction could be where Harry, as the Master of Death, has a secret connection with Daphne. Maybe Daphne discovers Harry's true power and they form an alliance to fight the remaining dark forces in the wizarding world. They could go on adventures together, using Harry's new - found status to bring about a new era of peace and magic.