Well I wont say I have discovered a definitive type, but I will tell you how I came across the theory.
I was always a lost person, in that I was constantly seeking affirmation of...well everything. This suggests reliance on others to an unhealthy degree of course, not entirely untrue, but not entirely true either. Anyhow, this resulted in a person who wanted to know about themselves, but who hadn't yet realised that experience and exposure to the world and other circumstances is how one learns.
A naive person who thought that he could understand through a vector of what others thought. Pathetic, a notion opposed to itself really; how can a person understand themselves through outside input? Oh yes I understand mirroring and being influenced by an environment and determinism. But that's just surface, even the most outgoing personality has an idea of self, even if it is wholly manufactured. I wanted to understand what that was in relation to myself.
So I ended up looking into theories of personality, although at the time I was too young to know that was what I was going towards. I started when reading a psychological overview of myself from a school psychologist at the age of around 8. My parents had struggled with me from the day I was born and I was an unpredictable and often stubbornly violent child, with a surface nature of reticence.
I became fascinated by an analysis of myself by this figure, perhaps one of the few times I had genuinely seen what someone else thought of me. Then this lead onto astrology and later in MBTI.
And there you go.