Hi Milo,
I can really relate to your beginning post because I always like to say that I am an introvert who can masquerade as an extrovert when needed--but only for short amounts of time.
I agree that small talk can be a challenge and that my favorite conversations are ones that go a little bit more in depth. A while back, I was telling a friend about watching the final movie in The Maze Runner trilogy and how I didn't really like the ending because, although it was a stereotypical happy ending, it just didn't seem very realistic. My friend also keenly pointed out that viruses mutate, and even if with a supposed cure, it probably wouldn't last long because the virus would change into a form that would be immune to the antidote anyway. These are the kinds of conversations I'd rather be having, but unfortunately, it can take a while to build that kind of rapport.
I've only taken personality tests a couple of times and to be honest, I forget what I was classified as but I know it was something a bit out of the ordinary because I tend to be a mix of extremes.
This is also the reason why yes, I agree with you in that I would probably need to be around someone with an easy-going personality. I can be very intense, so if I were with someone with the same personality type, it would depend on whether our reactions to life challenges wound up bringing us closer together or launching an emotional war between the two of us.