The Flash comic has indeed been cancelled. It might be due to various reasons such as low sales, changes in creative direction, or the publisher's strategic decisions.
The comic Flash typically has more established feats of speed compared to the DCEU version. However, different versions and story arcs can sometimes make the comparison less straightforward.
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 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.