I can recognize Six-ish reactions, interaction styles, body language and coping mechanisms quite easily, but as far as archetypes, there are none.
I love archetypes and what you said made me think and go research. I think two common ones might qualify, at least -
2. The Orphan/Regular Guy or Gal
Motto: All men and women are created equal
Core Desire: connecting with others
Goal: to belong
Greatest fear: to be left out or to stand out from the crowd
Strategy: develop ordinary solid virtues, be down to earth, the common touch
Weakness: losing one's own self in an effort to blend in or for the sake of superficial relationships
Talent: realism, empathy, lack of pretense
The Regular Person is also known as: The good old boy, everyman, the person next door, the realist, the working stiff, the solid citizen, the good neighbor, the silent majority.
6. The Rebel
Motto: Rules are made to be broken
Core desire: revenge or revolution
Goal: to overturn what isn't working
Greatest fear: to be powerless or ineffectual
Strategy: disrupt, destroy, or shock
Weakness: crossing over to the dark side, crime
Talent: outrageousness, radical freedom
The Outlaw is also known as: The rebel, revolutionary, wild man, the misfit, or iconoclast.
Those are both from soulcast.co.
Also perhaps the Unwilling Hero, the Sidekick, the Threshold Guardian, the Loyalist, the Devil's Advocate, the Bully.
That's all I can think of at the moment but maybe more later. Like I said, I love archetypes
Finding a 6's MBTI type can be hard, yes. That's due as much to MBTI stereotypes as 6 stereotypes too. Due to 6s often having a philosophical/intellectual/idealistic streak, I suspect some sensing 6s mistype as intuitive.
As individuals, I don't find 6s hard to read. The type itself is hard to describe because of how the fixation manifests in such a variety of personalities, but the individuals are not usually mysterious. I'm not saying they're simplistic or dull - not at all. I've been fooled by some too, but it was because of manipulation, not their being enigmatic.
"Charlotte sometimes dreams a wall around herself. But it's always with love - So much love it looks like everything else. Charlotte Sometimes - So far away, glass sealed and pretty." - The Cure
Fe doms are the hardest for me to read, at least motivation wise. I usually know they are Fe dominant and go from there but that's about it.
Anyone who doesn't have Fe, its hard for me to identify with anything going on in their head and thus, are difficult for me to read. STJ's and NFP's are mostly alien to me.
As an 8w7, I've been told by an ESFP boss I was extremely difficult to read at first. I'm quiet and say only what needs to be said, and I slowly test everyone's sense of humor and push the boundaries until I know how much room I have to wiggle without getting fired for it. Then I'm suddenly the loudest person in the room once I feel comfortable.