In most cases, it is legal to watch Negima Crossover fanfiction. Fanfiction is often considered a form of derivative work. As long as it is not being sold or used in a way that violates the original copyright in a major way (such as claiming it as an official part of the Negima franchise), it is generally okay. The creators of the fanfiction are expressing their creativity based on the existing Negima world, and most copyright holders tolerate fanfiction as long as it's for non - commercial and fan - based enjoyment.
I recommend 'Negima: The Alternate Path'. It offers a fresh take on the Negima universe. The author explores different relationships between the characters and adds some unique magical elements that make it exciting to read.
The themes in 'negima fanfic' can vary widely. One theme is friendship. Writers may create scenarios where the bonds of friendship between Negi and his classmates are tested or strengthened in unique ways. Another theme is mystery. Some 'negima fanfic' introduce mystery elements, such as a hidden secret about the school or a character's past that needs to be uncovered. There are also those that focus on the power dynamics within the story, like how different characters with different levels of magic power interact and influence each other.
You can start by looking on fanfiction.net. It has a large collection of 'negima fanfiction' stories. Just search for 'negima' in the search bar and you'll get a bunch of results.
One possible aspect of a Naruto Demon Negima fanfic could be the combination of different power systems. In Naruto, there are chakra-based abilities like ninjutsu and genjutsu. In Negima, there are magic spells. In a fanfic, characters might learn to combine these powers, for example, a Naruto character using a Negima - style magic spell enhanced with chakra. This could lead to really interesting battles and new storylines as they face new and unexpected enemies.
I'm not entirely sure as it could cover a wide range of ideas. It might be a fan - created story where elements from Naruto and Negima are combined in a scenario where Naruto is abandoned in some way within that fictional world. But without reading it, it's hard to say precisely.
A common theme is power combination. Since the sharingan has powerful abilities like predicting movements and casting illusions in Naruto, in Negima fanfictions, it often gets combined with Negima's magic system. For example, a character might use sharingan - enhanced vision to better control their magic spells.
You could also consider a crossover with 'Sailor Moon'. The Sailor Scouts and Negi's group could join forces to fight a common enemy that threatens both their worlds. The magical girls' powers combined with Negi's magic would make for some interesting storylines and power - ups.
One common theme is changing the past. Characters often try to go back in time to fix a mistake or prevent a bad event from occurring in the Negima world. For instance, they might try to save a character who died prematurely.
There are also some anime - related forums where fans might share or discuss Negima Crossover fanfiction. For example, AnimeForums.com. However, the availability might not be as extensive as on the dedicated fanfiction platforms. You may need to dig a bit deeper into the threads related to Negima to find the crossovers.