One common theme is loyalty. Pip is always loyal to Seras, and this is often explored in the fanfics. For example, in many stories, he will go to great lengths to protect her.
One interesting idea could be their unique relationship dynamic. Seras is a vampire and Pip is a human, so exploring how they bridge the gap between their two worlds can be really engaging.
There's also 'Seras and Pip: A New Chapter'. This fanfic focuses on their adventures together in a post - apocalyptic world where they have to fight against new threats while also dealing with their growing feelings for each other. It's quite action - packed.
You could also search for fanfictions that focus on the character development of both Seras and Pip within their relationship. Fanfictions that explore their backstories and how those influence their relationship in the 'hellsing' universe are often well - written and interesting.
The main characters are Seras and Pip. Seras is a strong and somewhat mysterious character with her own set of powers. Pip is often portrayed as a brave and somewhat roguish character.
In some Hellsing Alucard x Seras fanfics, the authors explore the psychological aspects of their relationship. For example, Seras' struggle to maintain her humanity while being a vampire under Alucard's influence. Alucard, on the other hand, has his own complex psyche shaped by centuries of existence. Fanfics that dig into these aspects can create a very deep and engaging story, as they peel back the layers of these two characters and show how they interact on a deeper, more emotional level.
A simple fanfiction idea could be that Seras and Alucard are training together. Alucard is teaching Seras some of his more advanced combat techniques. This would show their relationship as mentor and student, which is an important aspect of their connection in the Hellsing series.
One possible fanfiction could be about Seras and Alucard's adventures together against new threats in the Hellsing universe. They might have to face an ancient vampire clan that has risen again. Seras, with her newfound vampiric powers and Alucard's vast experience, would make a great team. Their relationship could be explored as they learn to trust each other more deeply during these battles.
One idea could be a crossover where Naruto is somehow transported to the Hellsing universe and meets Seras. Maybe Naruto's unique powers, like his shadow clones, could be used in battles against the vampires in the Hellsing world. Seras, with her vampire abilities, might initially be seen as an enemy to Naruto but they could end up teaming up.
There are many 'Satan x Seras Hellsing fanfics' out there, but 'Fateful Encounter' is quite engaging. It starts with an unexpected meeting between Satan and Seras and then unfolds a story full of mystery and a bit of a supernatural romance. The author does a great job of staying true to the Hellsing universe while creating a new and exciting narrative for these two characters.