It could blend the two universes by having Godzilla - like creatures be the result of dark magic experiments gone wrong in the Potter universe. Or perhaps the magic in the Potter world could be used to control Godzilla's power. For example, a powerful wizard might use a spell to direct Godzilla's atomic breath to defeat Voldemort.
One way to blend the two universes in a Harry Potter - Godzilla bloodline fanfiction is through the concept of magical creatures. Godzilla could be considered an extremely powerful and ancient magical creature. The bloodline aspect could mean that there are those in the wizarding world who are related to this creature in some way. This connection could give them unique abilities such as super strength or the ability to resist powerful spells. The fanfiction could also explore how the wizarding world's view of magical creatures would change if they knew about this Godzilla - related bloodline. There could be a conflict between those who want to use this power for good and those who want to exploit it for evil.
The blend could happen through the use of prophecies. Since Apollo is associated with prophecy in Greek mythology, the daughter could have prophecies that are different from the ones in the Harry Potter series but still relevant to the overall battle against evil. This would introduce a new layer of mystery and foreshadowing. Also, the daughter's connection to the sun, as Apollo is the sun god, could be used to counter the darkness associated with Voldemort. Maybe she can create light shields or use sunlight - based spells.
It could blend the two universes by having a shared threat. Let's say an evil force is using both dark magic and the power of the Star Destroyer to conquer both the wizarding world and the galaxy. Harry Potter and his friends would then team up with some of the more heroic characters from the Star Wars universe, like Luke Skywalker. They would combine their skills, with the wizards using magic to counter the dark magic and the Star Wars characters using their blasters and ships to fight the Star Destroyer - related threats. This would create a really interesting dynamic where two very different worlds have to work together.
One way would be through the use of magic items. The Elder Wand from Harry Potter could be compared to the Fierce Deity Mask in Majora's Mask. Both are powerful and somewhat mysterious. The characters could also cross over, like Hermione finding herself in Termina and using her vast knowledge to figure out the secrets of the masks. Another aspect could be the concept of time. In Harry Potter, time - turners are used to go back in time, and in Majora's Mask, the time - looping is a central theme. So, a fanfiction could explore how these two time - related concepts interact.
It could blend the two universes by having the characters use elements from both. For example, Harry could use his wand and also learn to use the Force. The Jedi Grand Master could use spells along with his lightsaber.
A 'Harry Potter Cheshire Cat' fanfic could blend the two universes by having the Cheshire Cat enter the wizarding world through a magical portal. Once in the world of Harry Potter, it could interact with the characters using its unique abilities. For example, it could use its disappearing act to steal food from the Hogwarts' kitchen without being noticed by the house - elves.
Well, it often has Harry using Hitman - like skills. For example, stealth and precise attacks. In some fanfics, he might use magic to enhance these skills. Like using a silencing charm while sneaking up on an enemy, just like a hitman would use his training to be quiet.
In fanfiction, the two universes blend in multiple ways. The characters from Harry Potter can be put into Creepypasta - like situations. For instance, Harry might find himself in a situation where he has to face a entity that is not from the wizarding world but from a Creepypasta realm and has to use his magic in a new and untested way to survive. Also, the magic in Harry Potter can be warped to fit the spooky nature of Creepypasta. Spells could have unexpected and disturbing side - effects that are more in line with Creepypasta. The creatures in Harry Potter can also be made more menacing by borrowing elements from Creepypasta. For example, a Hippogriff could be made to look more like a nightmarish beast with Creepypasta - inspired features.
In these fanfictions, they blend by sharing certain characteristics. For example, the loyalty and camaraderie among the characters in both universes are emphasized. In Harry Potter, it's the loyalty among the students of Hogwarts and the Order of Phoenix. In Kancolle, it's the bond between the shipgirls. This common trait can be a basis for the two universes to interact, like the shipgirls and the wizards/witches working together based on mutual trust.
One way would be through the use of ingredients. In the Harry Potter universe, there are magical ingredients like unicorn hair or dragon liver. In the Ramsay - led kitchen, these could be transformed into extraordinary culinary delights. For example, a potion - like sauce made from dragon liver that Ramsay teaches Harry to cook with proper techniques.
One way is through the use of magic and advanced technology. For example, Guinan's knowledge of time - travel technology could be combined with the time - turning magic in the Harry Potter universe. This would create really interesting plotlines.