I also only know some of the fandoms, but at least I've got 9 out of 15, plus vague notions about another 3, to work from.
You seem to like/appreciate/be drawn to people who are comfortable and secure with the fact that they're a bit on the outside of the central group/established norm; who know that they contribute valuable insight from being in that position; who can work independently without fear of that status; who do not wallow in angst.
There's an element of helpful/intelligent/knowledgable/heroic etc. as well. If not highly intelligent, then possessed of solid street smarts; also, spunky/brave/hard to intimidate.
ETA: Also, a common quality of being matter-of-fact in who they are, what they do, being heroic and unusual, etc. This is part of the not-wallowing-in-angst element, but is also a specific characteristic on its own.
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You seem to like/appreciate/be drawn to people who are comfortable and secure with the fact that they're a bit on the outside of the central group/established norm; who know that they contribute valuable insight from being in that position; who can work independently without fear of that status; who do not wallow in angst.
There's an element of helpful/intelligent/knowledgable/heroic etc. as well. If not highly intelligent, then possessed of solid street smarts; also, spunky/brave/hard to intimidate.
ETA: Also, a common quality of being matter-of-fact in who they are, what they do, being heroic and unusual, etc. This is part of the not-wallowing-in-angst element, but is also a specific characteristic on its own.