Yes, there are quite a few out there. You can check fanfiction websites like Archive of Our Own. Some stories might focus on their friendship, while others could explore more creative scenarios like them going on adventures together.
Definitely. Fanfiction often gives new life to relationships that might not have been fully explored in the original work. In Tallstar x Jake fanfiction, you might see them going on adventures together, or facing challenges side by side. The creativity of the writers can make for some truly unique and enjoyable reads.
The Hunter x Hunter manga is unfortunately not complete. The author has faced various issues that have led to intermittent breaks and an unresolved storyline.