Cisgender means not transgender. Those are binary antonyms. If you change your gender from what it was assigned at birth, you are transgender and therefore not cisgender. To complicate things, if you are transgender, you were never cis. None of this has anything to do with genitals other than that is generally one of the main inputs the doctor who assigns your gender at birth uses. It's like being assigned white or black upon birth by a doctor, they just use their best guess and often take liberties and sometimes even make changes and those changes turn out to be wrong... They should not be making assumptions or decisions or changes unless strictly necessary, which they are often not. So a god whose existence at birth is fluid, would be, like the rest of us, whatever they were. But, for ease of language, likely fall under they/them, depending on reference purpose, like a wiki or their own desired image or role. You would have to ask them. Just like everybody else. When in doubt, just ask. In general, though, I think most gods are above gender, as gender is a human social construct and gods are.... Well, those things are dumb and don't apply because gods usually don't give a shit and don't play by your silly little self imposed made up rules like who makes house and who works and who is more courageous and who proposes or whatever garbage.

Sex and gender are entirely decoupled. They are unrelated. Disconnected. Not at all related. Different. Not the same. Irrelevant. Not even part of the discussion. Non sequitur. A la carte. Separate. Apples and oranges. Cars and colors.

Gender-swapping has been a common theme in fictions/legend for as long as we had these. And my hot-take is that RPG didn't started to attract LGBT player in the last decade, but society didn't let these player be open with themselves before the last decade, and that some of these players who in the 80's/90's/00's used gender swapping as a theme in their stories would actually come-out/transition if they were 20-30-40 years longer.

What's the show? I think I saw it but I don't remember this part. And I don't remember the name so I can't look of there's a new season.

Well, this doesn't really matter for the discussion since Corellon doesn't really have a body with sexual characteristics. I'm just a trans girl, so I can't speak with authority, but it seems "genderfluid" is in the same bucket as "non-binary"; in that, both are part of the umbrella term "transgender", but people can resonate with either and not apply the transgender label to themselves. At the end of the day, labels are boxes that don't always encompass human experience. I'd also add "perisex" and "unchanged" to your use of the term "male body". Around 1.5% of the world's population has some sort of intersex variation, meaning they have a combination of sexual characteristics that don't fit into the typical norms for their assigned sex at birth (you may have seen these people referred to as "hermaphrodites", but the intersex community considers this a highly offensive term due to its use in dehumanisation).

For humans, yes. For other species, not so much. A clownfish isn't trans just because it changes its sex. In fact, it's cis all the time, because its the biological sex that changes. If the character naturally, natively changes their sex, they aren't trans either. Humans cannot change their sex, they can only change their gender. That's what trans people do. If an animal or a being can change their sex, they are still cis while doing so (unless they change their sex and then change their gender to a different one at the same time). But the concept of trans just plainly doesn't apply to many species. Some have more than two sexes, some have more than one sex at a time. When talking about other species, sex is really not a solid thing at all.

A clownfish naturally changes its biological sex. That's what it does. Is it trans or cis? A snail has both sexes at the same time. Is it trans or cis? Or does the concept of cis/trans just not make any sense at all in a species that doesn't have two static sexes and doesn't naturally change between them?

Gender has nothing to do with sex.

Vox Machina, and there is a new season.

Exactly. So if some being can change it's sex at will, is that cis or trans?

I agree with most of what you say, but human can absolutely change their sex. What do you think hrt does? Sex is a collection of biological realities, all of which lands you somewhere on the sex binomial spectrum. Some things are impossible to change (chromosomes and dna), while others are very much possible (ratio of hormones or sexual organs). I like this chart: 

don't these motherfuckers get tired of being mad about everything being woke. I can't imagine living my life so unhappy that I am angered by the single though of a trans person in media. These clowns need to get a fucking life.

On the contrary, they *love* being mad

As you said, it's impossible (at least for now) to change all of these biological realities. HRT is good for what it does, but it doesn't fully change one from one end of your spectrum to the other. Biologically, the only real purpose for a biological sex is procreation. Afaik, there's currently no way for someone who was born as a woman (left end of your spectrum) to procreate as a man (right end of the spectrum) or vice-versa. The rest is, to me, gender, not sex. (And yes, one could argue that e.g. infertile people or people after hysterectomy/orchiectomy don't have a biological gender, but then again, apart from procreation and maybe some medical stuff, the biological sex doesn't really matter and everything else is really just gender. And isn't that also the basis of the concept of being trans? That the biological sex isn't an imperative/doesn't really matter and that thus you can change your gender?)