So I wanted to start a conversation about how Goa'uld are described in the "Gender" section on their pages. I don't think "Agender" is the correct descriptor and I say this as an agender person myself. I also think that "Male" or "Female" personality isn't correct either.
From what we know the Goa'uld don't really have sexual characteristics because the symbiotes don't reproduce sexually. This would mean they can't be male or female. Hermaphroditic or intersex wouldn't be appropriate either because both those labels require the presence of sexual characteristics. The best descriptor for their sex is in fact "sexless".
As for their gender it's clear that when they inhabit hosts they choose to present their gender in specific ways.
Jolinar was said to take mostly female, women, human hosts. She was also described with she/her pronouns and other terms associated with women. So I would say that her gender would be "Woman".
Selmak I would describe as gender-fluid, as they performed the gender of the host that they took. This is likely in part that Selmak's relationship with their host was consensual and allowing the host to maintain their gender presentation was probably a part of this agreement.
Osiris is an interesting case. While Osiris as a historical god was a man and took male hosts, he took Sarah, a woman, as a host. They were still referred to as "he" in the series yet his clothing was arguably quite feminine. If I had to put a label on it I would say that Osiris is a gender-non-conforming man.
I was just musing on this as I continue my rewatch of SG-1. It's interesting to look back on all the missed opportunities to tell queer and trans stories in such an adventurous show. It doesn't dampen my nostalgia though.
[edit: obviously I know the meta reasons of why they weren't seen as trans or nonbinary in the show given the lack of awareness during the show's run. this post is more referring to how we look back on them and refer to them]
