Yes, the Uzaki-chan manga has come to an end. The creator completed the story and it's no longer ongoing. Fans have had the chance to see the full tale unfold.
The movie City Hunter, which starred Chan Chan, was based on the Japanese manga City Hunter. The manga told the story of the protagonist Lee Jun's adventure in the city. Li Jun was an agile and quick-witted superhero. He used his skills to protect the safety of the citizens in the city.
I'm not entirely sure as it depends on the specific fanfic. It could be about magical adventures in a world related to 'akebi no hana', perhaps with unique characters and their own stories.
I'm not sure specifically as 'akebi ni hana fanfic' could cover a wide range of things. It might be a fan - made story related to a work named 'Akebi no Sailor Uniform' perhaps, but without more context it's hard to say exactly.