Kira's downfall in the Death Note manga occurs when his identity is exposed and he's cornered by the forces opposing him. It's a combination of smart detective work and unforeseen circumstances. His fate is both tragic and inevitable given his actions.
A-Kira's story and Death Note might be linked in that they could exist in the same fictional universe, or A-Kira's actions could be a consequence of events related to Death Note. However, it all depends on how the story is crafted.
No. Harry Potter and Death Note are two completely different universes with their own distinct settings, themes, and characters. Harry Potter is a story about a young wizard in a magical world fighting against the dark wizard Voldemort, while Death Note is about a high - school student who gets a notebook that can kill people. Combining them in such a way as 'kira death note fanfiction' for Harry Potter seems inappropriate and forced.
It could be an interesting experiment, but it would be extremely challenging to pull off successfully. Firstly, the magic system in Harry Potter is very different from the power of the Death Note. In Harry Potter, magic is something that can be learned and controlled to some extent, while the Death Note is a very specific and deadly tool. Secondly, the moral and ethical landscapes of the two stories are distinct. Harry Potter has a more black - and - white view of good and evil in many ways, while Death Note is all about moral gray areas. Combining them would require a great deal of creativity to make it work without completely ruining the essence of either story. However, most likely, it would end up being a rather odd and disjointed piece of writing.
I'm not sure yet as it's a new story. But it could be new characters who discover the Death Note, or perhaps some descendants of the original characters like Light or L.
Perhaps in the 'new death note story', the Shinigami who are associated with the Death Note have changed their ways. They could be interfering more directly in the human world, either to protect the Death Note or to stop its misuse. This would add a whole new layer of conflict as humans would have to deal not only with the power of the Death Note but also with the meddling Shinigami.