I use they/them and vi/vir, and have been for years now so I'm fairly set on them at the moment. I've been using they/them for a much longer time, and I'd discovered the common neopronoun set ve/ver. I kinda liked them and the history they have (if I'm remembering right they have been used in an older science fiction novel), but I had some qualms with using it to describe myself- I felt "ve" resembled the pronoun "he" too much, at least in writing, for me to really be in love with them. So I started using the modified vi/vir/virs pronoun. It's pronounced the same as the more common ve/ver basically, but it *feels* better, you know?
I've yet to see anyone using vi/vir besides me, or see it listed on other sites or anything of the sort. As far as I'm aware I'm the only one who uses vi/vir LOL