Quote Originally Posted by QT_Melon View Post
Honestly wouldn't be surprised if their culture had certain perceptions of the world and own symbols that when they made the wills, it would be conceived from those ideas. I mean have we yet to see an "accurate" primal? Wasn't each primal basically a thoughtform of something based on a perception? (Even if the one they're basing it from actually existed at one point?).
Primals are indeed based on what their summoners think they should look like, yes. I would assume, based on circumstantial evidence, that the only "accurate" Primals we see are mostly the ones who were summoned when their summoner personally knew the original. In other words, Bahamut and Enkidu. (And technically "original" Primals like Alexander and Shinryu, but those don't count for the purposes of the question.)

Also Odin, or more precisely Zantetsuken. I haven't finished Eureka, so I don't know the full details of that.