To explain Ze and Hir to people who've never heard them before, from my personal experience;
Ze is typically used for 3rd gender or any other non-male/non-female identifying people, such as gender-neutrals, agenders, and everything around there, sometimes genderfluids and genderqueers as well. This is just from what I've seen personally, I've also seen one or two transmen refer to themselves as ze for unknown reasons. I've also seen a few cisfemales refer to themselves as Ze, mostly to throw the whole "I hate lables so I made myself a label" crap around. Honestly I like Ze more than "they" or "it", which a lot of people find highly offensive, but I definitely wouldn't refer to myself as Ze. Not only because I identify as male, but I think it'd be confusing, as people who aren't familiar with the term may think your name/nickname is Ze, not your preferred pronoun.
Hir is a bit more specific and usually refers to hermaphrodites*, intersexed people and shemales** (don't rage at me yet). I've RARELY seen people refer to themselves as hir, and it's usually fetishists referring to their persons of interest. This is seen -a lot- in fetish art communities and porn, I don't think many people use this one in normal conversation about themselves. I've never seen this used for "pussyboys/cuntboys/cb oys"*** (sometimes what post-mastectomy pre-bottom surgery FtMs are referred to as, especially in porn) though, as in people with a vagina but no breasts (usually masculine identified), it seems to be specific to those with breasts and a penis (at least). If you (anyone who reads this) prefer to be referred to as hir, please don't be offended by my post, this information is solely based off of my experience in the GLBTQ and various online art communities. If you do, I'd love to hear about it! I've yet to meet someone who uses that pronoun for themselves
* hermaphrodites, as in the outdated term for insersexed folk, people who are either between sexes or have both sexes genitalia.
** shemales, the term for usually feminine people with breasts and a penis but no vagina, mostly used in porn. Most people find this term pretty offensive, but I have yet to hear of anyone recommend something better (or hear complaints from people who ARE "shemales"), so I'm not sure what to think about it. This is NOT the correct term for pre-bottom surgery transwomen unless they SPECIFICALLY say they prefer it!
*** pussyboys/cuntboys/cbo ys, like stated above, someone usually masculine identified with no breasts but has a vagina, this is NOT the correct term for pre-bottom surgery transmen unless they SPECIFICALLY say they prefer it!
I tried to keep this post as un-offensive as possible while still covering everything, if I did offend someone somehow, my apologies. I'm in no way bashing or promoting the use of any of these terms, people should be called what they want to be called and that's that.