Hi everyone (or, more accurately, "hi, anyone who might be reading this post in particular"),
INFJ 6w5 here, new to this site but not new to MBTI and enneagram discussions.
My initial primary purpose for delving into this stuff was trying to understand some of the (sometimes really confusing) dynamics between me and my INFP 9w8 partner, and that remains a focus for me still. The cognitive function approach has been particularly useful, since our functions are so different even if the types appear to diverge only by one letter. The function differences really show in how we each process things and can sometimes make communication challenging.
I've also found the cognitive function approach really useful in understanding things about myself at this stage in my life, in particular re-claiming Se in service to dominant Ni and moving more and more from that Ni-Se perception - so freaking awesome when I allow myself to trust it.
My user name comes from an INFJ-INFP discussion about "If you were a shape-shifter, what would you shift into?" and a questioning of the assumption that all shape shifters have to be predators in their non-human form. The still-unanswered question is where would the rest of my body mass go if I shifted into a human-sized budgie. That question aside, I would LOVE to be able to fly.