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To be fair, I haven't seen many of them. They exist, but I don't think they tend to be very successful in the West; there's a market for martial arts steeped in mystical fluff, but the Omoto-kyo Shintoism that the more esoteric aikido branches are rooted in is deeply weird even by Japanese standards, and it doesn't fit particularly well with the watered-down holism-and-wellness narrative that Western students who're so inclined tend to expect.
The branch of aikido I'm most familiar with is Yoshinkan, which is one of the earlier, harder ones.
Interesting. I looked up Omoto-kyo and it seems I have underestimated its weirdness. Zamenhof as a kami is an... unusual idea :-/
But returning full circle, it doesn't seem wise for a girl who sees spirits to start a practice the mystical bits of which involve possession by spirits...