Well, many 'Harry is immortal fanfiction' stories deal with the theme of sacrifice. Just because he's immortal doesn't mean he can't sacrifice things. In fact, his immortality might make him more likely to sacrifice himself for others in certain situations. Another common theme is the exploration of different magical abilities. Since he has an unlimited amount of time, he might discover new and unique magical powers that normal wizards don't have access to. And of course, the theme of good vs. evil still exists. His immortality can be a major factor in the battle between good and evil in the wizarding world.
One common theme is Harry's struggle with his new - found immortality. He has to deal with outliving his friends and loved ones, which can bring a lot of emotional turmoil.
The themes in 'Harry Potter is immortal' fanfictions usually include a search for purpose. Harry has an endless life, so he needs to find something meaningful to do. There is also the theme of change. While he doesn't age, the world around him does, and he has to adapt. And of course, the theme of mortality in contrast to his immortality. He is constantly reminded of the fact that everyone else is mortal, and this can create a lot of internal conflict within him.
One common theme is loneliness. Since fem Harry is immortal, she will likely outlive her friends and family. This can lead to a sense of isolation as she watches those she loves age and die while she remains the same.
One common theme is the clash of cultures. Harry comes from a world full of magic and wizardry, while Firefly has a more gritty, science - fictiony, space - faring culture. Another theme could be redemption. Harry might use his immortality to right wrongs in the Firefly universe.
One common theme is the clash of cultures. Naruto comes from a world of ninjas and Harry Potter from a world of wizards. So, when they are combined, there is often a struggle to understand each other's ways. For example, Naruto might not understand the concept of magic wands at first, and the Hogwarts students might be baffled by his chakra use.
Well, a frequent theme is the idea of immortality and its consequences. In Harry Potter, immortality is often a more magical and less physical concept, while in Twilight it's very much a physical vampiric state. Fanfictions might explore how characters deal with this difference. Also, the theme of friendship and loyalty can be seen as characters from both worlds form new relationships. For example, Harry might have to decide whether to trust a vampire from Twilight when they're in a difficult situation together. And this can lead to complex character development as they navigate these new relationships.
One common theme is the power struggle. Since immortality often brings great power, characters might fight over it or struggle with how to use it in a world where there are already complex power structures in both the Harry Potter and Percy Jackson universes. Another theme is friendship. Characters from the two series might form new friendships or have their existing friendships tested in the face of new challenges brought about by the combination of the two worlds and the immortality factor.
One common theme is the pursuit of victory at all costs. In many 'immortal game fanfiction', characters are willing to sacrifice a great deal to win. Another theme is the mystery surrounding the game. It's often depicted as having secrets that are waiting to be uncovered.
One common theme is loneliness. Since Naruto is immortal, he may outlive all his friends and loved ones, which can lead to a deep sense of isolation. Another theme could be power. His immortality might be tied to some new or enhanced power, and he has to learn to control it. Also, there's the theme of legacy. As he lives on, he has to think about the kind of mark he wants to leave on the ninja world.
One common theme is eternal love. Since they are immortal, their love can be explored in a more profound and long - lasting way, defying time.