User blog comment:San&Ashitaka/TITAN THEORIES/@comment-3118594-20131012164128

Long prior to the whole Dr. Kichirou Moto theory, I had thought that maybe these Titans were an extraterrestrial humanoid entity. In fact, when I first exposed myself to the AoT series and I saw these Titans, the one word that I kept thinking was "Nephilim". The Nephilim were a race of giants that walked the earth thousands upon thousands of years ago, and they are mentioned in the early parts of the Tanakh. However, all things considered, I kind of stopped using "Nephilim" to address the Titans; if anything I use the term as a slang, but I almost always call them Titans.

Until we know for sure, I still like to think that the origin of the Titans is something metaphysical, perhaps supernatural.