User blog comment:VedranTheII/Pretentious Diaries 1: Are my semblances worthy?/@comment-26018514-20150628101130/@comment-26018514-20150629171723

agreed, fractal Semblances seem likely though less of a "this is yours just less powerful" and more like, you can control magnetism, I can magnetize objects kind of thing.

Then their is my headcanon that no-one started out with elemental semblances, they are all the result of ancestral dust use mutating the semblance of the bloodline, though of course I see bloodline Semblances as being common, but the creation of each semblance as unique and quite susceptible to random mutations easily capable of exceeding bloodline parameters, though I think that occurs very rarely if at all, not that it really matters if you go back x number of generations.