This actually made me wonder exactly who my favorite character is. If we're taking across all media that's definitely a hard call.
Lt. Commander Data is a strong contender though. Potentially also Michael from The Good Place. Juri from Street Fighter is also in the running, just to mix things up here.
Not sure of the specifics on the article, but astronomical voids are their own specific thing, not just the vacuum of space.
https://en.wikipedia.org/wiki/Void_%28astronomy%29