I've never heard of One, E, or Ey as pronouns. One feels, like, unattached to gender, but not in the dehumanizing way It does. E feels like the binary version of "they" if that makes sense. Like, it's in the realm of she/he but still ambiguous. Ey has kindof an opposite feel. I'm still figuring out my own stuff, those three stood out tho, I'll look more into them and the people who use them!