What role does introspection play in your life?
Introspection plays a gigantic role in my life. I like to discover things about myself and refine what I already know, I always try to pursue new possibilities to see how do they affect me personally and also because I think it's important to have an "established personality" so you can tell yourself apart from others and have a clear sense of identity.
Is it your primary activity, or a means to an end?
Both. Means to an end 'cause it helps me to navigate life easier, after all through introspection I get to know myself thus if I ever approach a situation for the first time I can be sure of what I want since my values are established and I'm sure of what I think it's the right thing to do.
Do you enjoy it, dislike it, or are you neutral about it?
It's pretty clear that I enjoy it in an almost unconscious level. I also can't really see how someone might not enjoy not knowing who they are unless they might have dark tendencies that they prefer not to touch upon on or let them remain hidden, but that's just me guessing.
PS: Enneagram probably plays a big role in all this since I'm a 5w4 and (from what I've read) 4s basic desire is to create an identity.

Beyond introspective. I have rarely encountered anyone who has an inner world as vast and extensive as mine, at least, to my knowledge. My inner world is far more interesting, intense and meaningful to me than most of what I have discovered in the world outside.  I feel my life's purpose is to channel the spirit of my home planet through my art and mindset.