One possibility is that the story focuses on the relationship between Harry and Blaise. Harry, with his status as the Master of Death, is both feared and respected. Blaise, on the other hand, might be initially skeptical of Harry. But as they get to know each other, they realize that they can work together to fight the darker elements of this new world. Maybe Harry uses his knowledge of death - related magic to protect Blaise from the more dangerous vampires or other threats in the Twilight - inspired part of the story.
Perhaps it starts with a prophecy that involves both Harry and Blaise in this Twilight - esque world. Harry, already being the Master of Death, is summoned to this new place. He arrives and discovers Blaise, who has some sort of connection to the prophecy as well. They start off on a journey to figure out what the prophecy means and how it relates to the strange new world they are in, which has vampires, werewolves, and other Twilight - like elements.
It could be an epic crossover. Harry, with his mastery over death, might bring some unique magic to the Avengers. Maybe he could use his skills to revive fallen heroes or protect the world in a different way than the Avengers are used to.
One common theme is the exploration of power. Harry, being the Master of Death, has a certain level of power, and when combined with the Twilight universe, it often leads to stories about how he uses or struggles with that power. For example, how he might interact with the vampires and werewolves in the Twilight world with his unique abilities.
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, in a fanfiction context, one way it could be possible is through some sort of magical crossover event. Maybe the magic in the Harry Potter universe has a strange interaction with the supernatural elements in Twilight. For example, the concept of the Master of Death in Harry Potter might give Harry some sort of power or ability that allows him to traverse into the Twilight universe and interact with its characters. It could also be that a powerful wizard or vampire in a fan - created story figures out a way to merge the two concepts, perhaps using some ancient magic or vampire lore that ties the two together.
Well, you can try looking on fanfiction.net. There are often a great number of fan - fictions related to various crossovers. Just search for 'Harry Master of Death Twilight' there, and you might find some interesting ones.
It could be about a character from Twilight, perhaps Edward or Bella, becoming a master of the universe. They might gain some sort of all - powerful abilities and have to deal with the consequences. For example, if Edward became a master of the universe, he'd have to balance his new power with his vampiric nature and his relationship with Bella.
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.
Well, in this 'harry master of death bleach fanfic', perhaps it delves into how Harry's status as master of death gives him an edge in the Bleach world. It could be that his connection to death in the Potterverse translates into some sort of understanding or power over the concepts of life and death in Bleach. For example, he might be able to interact with the souls in a different way than the regular Soul Reapers. He could bring a whole new perspective to the battles and politics in the Bleach universe.
Perhaps it's a warning. There might be some danger approaching Harry, and Blaise, having come across this information, decides to inform him. For example, if there's a new dark wizard in the school or some sort of plot against Harry that Blaise has uncovered.