User blog comment:Plexioth- xD/Monster Hunter 3 Ultimate/@comment-186.145.130.238-20120213032322/@comment-70.54.115.173-20120213094336

You do realize that the letter G isn't native to Japan, right? The meaning has to come from somewhere, like how "w" is the same as "lol" in Japan because it's short for "wara", or how it's used to mean "double".

Look at the anime Great Dangaioh. Notice how it's written both Great Dangaioh and G Dangaioh. That's because the G means "Great".

The first giant robot anime was a series from the '70s called Mazinger, followed up by a successor called Great Mazinger. The G is also used by other anime giant robots like Getter Robo G.