

When you describe something as “glowing”, you are implying some sort of government or law enforcement interference. It was coined on 4chan’s /g/ board and spread by /pol/ (as they often do) while they were in their infatuation phase with TempleOS creator Terry Davis, who was quoted as saying “The CIA n*****s glow in the dark, you can see them if you’re driving. You just run them over, that’s what you do”.
Japanese was written vertically, so characters are ordered from top to bottom while it is the lines which are separated from left to right. The slow leftward advancement allows a person writing on a scroll to write with their right hand while unrolling the scroll gradually with their left. In modern times you can write Japanese horizontally, but in that case you usually write from left to right. Characters written horizontally from right to left is only done in exceptional cases.