Naruto Hellknight Ingrif fanfics are unique because they blend two distinct concepts. The Naruto world is filled with ninjas, jutsus, and complex political systems. When you introduce Hellknight Ingrif, his different moral code and combat style can create interesting conflicts. For instance, his way of dealing with enemies might be completely different from how Naruto characters usually do. This can lead to fresh and exciting storylines that deviate from the typical Naruto plot, making the fanfics truly one - of - a - kind.
I don't think we can assume she's a villain. Just because she has 'another story' doesn't mean it's a story of villainy. She could be a bystander who gets involved in the events in Gotham in a positive way, like helping Batman or the police in some way.
Ingrid faced a series of challenges and unexpected events. But it's hard to give a detailed account without knowing more specific details of your question.
Their relationship would likely become more protective. Gregorio would be constantly worried about Ingrid and the baby. He might start taking on more dangerous tasks himself to keep her out of harm's way. Ingrid, on the other hand, might feel a bit smothered at times but also appreciate his concern. They would also have to communicate more about their future plans, both as spies and as parents.
One popular Naruto Hellknight Ingrif fanfic is 'The Adventures of Hellknight Ingrif in the Naruto World'. It has an interesting plot where Ingrif uses his unique skills to navigate through the Naruto universe. Another one could be 'Ingrif's Bond in Naruto', which focuses on his relationships with the various Naruto characters.
I don't know who created the 'Ingrid Never Ending Story'. There could be an individual writer, perhaps an amateur or a professional, who came up with this concept.
I'm not sure specifically what 'Ingrid Never Ending Story' is about as it could be a very unique or personal creation. It might be a story that features a character named Ingrid and has an ongoing, perhaps fantastical or complex plot that seems to have no end.
One common theme is the clash of different cultures. Since Ingrid is from a different background, her encounter with the Naruto world's unique culture often leads to interesting situations and misunderstandings at first, which then develop into mutual understanding.