Sure. Hellsing is considered good by many because of its compelling narrative, complex characters, and the way it combines horror and action elements. It's a fan favorite for a reason.
Immortality in Naruto - Hellsing fanfiction can bring a whole new level of storytelling. In Naruto, some characters are effectively immortal through means like the tailed beasts' chakra. In Hellsing, vampires are immortal. Combining these, a story could be about a character trying to find a way to end the immortality curse. Maybe Naruto uses his sage mode to understand the nature of vampiric immortality in Hellsing.
One possible crossover in Naruto and Hellsing fanfiction could be the sharing of powers. For example, Naruto's ability to use chakra could be combined with the vampiric powers in Hellsing. Maybe a character from Naruto gets turned into a vampire and has to deal with the new powers and the moral implications in the Hellsing universe.
Overall, Hellsing Ultimate is reasonably close to the manga. Some minor details might be different, but the main story and the core characters remain consistent. The animation style also does justice to the manga's dark and intense atmosphere.
Seras Victoria is also well - liked. In fanfiction, she can be a central character for gamers who want to explore her growth as a vampire. They might write about her learning new combat skills in a gamified way or having to overcome in - game challenges related to her vampiric nature.
One common theme is the clash of different power systems. RWBY has its Dust - based powers and Huntsmen, while Hellsing has vampires and their unique abilities. Fanfictions often explore how these powers interact.