make that 3 girlbug2, just took the test, i'm a rational apparently. Yet i train in a traditional art, am drawn to hierarchy, formal traditions etc. Could also be my upbringing which influences that of course.
With regards to what the op, urban coyote was saying, i was coming at it from a tma point of view as well as that's all i've really had exposure to. I studied goju ryu karate for a while when younger and am now in ninjutsu - 3 years/5th kyu. With our art, a lot of people do tend to be attracted to it purely because they've seen ninjers on tv and movies do awesomely impossible things and they want to do those things as well. During chats with my sensei about the different types of people that come in and train, he mentioned that it's easy to see who's there for the fantasy aspect and who's there to seriously train. Funny thing, the ones that are serious about the art are generally the ones who stick it out from what i've seen. There have been numerous people turn up for a class or 2 and then never return because they didn't get to wear the cool uniform and throw ninja stars from trees.
In the op it was also asked if black belts had different personalities. Imo it's not that only an elite group of students with the right personalities can become black belts. I personally like to think that over time, with training the mindset required of a black belt will develop in each practitioner and their personality will broaden to suit that as they mature and internalize the art more.