The Flash isn't usually depicted as Hispanic in the mainstream comic versions. However, there might be alternate universes or specific story arcs where his ethnicity is presented differently.
Well, the origin of Flash varies depending on the comic version. Sometimes it's a lab experiment gone wrong, and other times it's a mysterious force that grants him super-speed. But in most cases, it's a sudden and unexpected event that transforms him.
The Starry Sky of Two Worlds was a sci-fi/space-time travel novel written by the author, Wu Bi, in Pinyin. The story was about Su Xingfeng, a ring that could travel between two worlds. He could travel freely between the two worlds and enjoy endless resources. This novel was updated to chapter 64, and the latest chapter was the Void Spirit Gathering Array.