Half-Githzerai?

A half-gith? It would have to be some kind of accident/charm/magic/evil test gone wrong. Githzerai are too proud of their heritage and far too insular to ever breed with any NOT of their stock. And Githyanki surely have too strict a caste system for them to even consider breeding with lesser beings?

Also, I might be wrong but didnt I read somewhere that Gith are more reptilian than mammalian? I might be crossing races here (been out of the link for a while) but im sure I read that Gith have a reproductive system similar to Alligators and Crocs.

Even if the latter isnt true, id say the former is enough reason to say that a half-gith is a unique or very nearly unique occurance.

These are two really good points.

But I would even say that Unearthed Arcana takes a somewhat "touchy-feely" stance on the Githyanki that I don't really share.

My own two cents is that half-gith would be more likely produced from "lost" gith colonies, ones similar to the renegade encampments that have been published from time to time (and there's a new one in this month's Dungeon).

Half-gith from the astral empire? I doubt it.

"Take pity on captured prisoners? Pity? The very word is an insult to untold millennia of bloodshed by my people. No self-respecting Son of Gith would ever consider that a prisoner could be worth anything. A prisoner, who lacked the courage and fortitude to succeed or at least kill itself when victory had escaped. The suggestion that a human could be raised.... 'as one of our race' gives me an urge to vomit. No mere human could even be spoken to as one would to a true avenging Son of Gith. Those fools have not passed through the crucible. They have not earned the honor for which my glorious decendants have fought and died. It disgusts me. You must be thinking of the pathetic degenerate minions of that ruinous traitor, Zerthimon. That sounds like their sort of idea."
~Hrun Kre, githwarrior, who finds the idea of Unearthed Arcana's githyanki bloodlines to be revolting.

first of all, this is my first post. hi.
Anyway, onto the meat of the issue...
The gith races were once human and an interbreeding of them and humans would be possible, if far-fetched. Their egg-laying, which occurred as a result of the most hated illithids' cruel and torturous experiments, make them odd for mammals, but they remain mammals nonetheless. As this happened before the ideological break of the 'zerai and 'yanki, both should be egg-laying species...
But I'd allow it, so long as a reason for the union was given and explained well. I'd also say that the baby would be born in the manner of the female parent, but a bit more to the middle. A human-born half-gith would have a thick placenta at birth and be a short (8 month?) pregnancy. One born from a gith would be similar to that of a gith's birth, but would have a thinner, softer egg, and take longer to birth. I'd also make them sterile, just because of the odd admixture of reproductive systems.

It's a valid theory.

Now, now, there's certainly a lot of supposition in that first sentence. There are some references to the gith races being from a "human-like" race that was twisted by the illithids, but that's not exactly saying they're human. I personally always liked the uncertainty of gith origins. They could be twisted humans, xephs, elves... Hell they could even be mutated dromites! But, like everyone else that's posted, the concept of half-gith is just too interesting for me to dismiss. I think we all had the same reaction: "Hmmm... The appeal of gith without the prerequisite social mores? I'd be a fool not to give it a whirl!"

I don't mind the Gith races being descended from some generic humanoid, or from humanity itself-- either way works for me, and since they're so widely divergent from humanity, they don't even need to retain the Human subtype.

I just don't like them as egg-layers, though I'm getting to the point that I can stomach the notion for Githyanki, because of the draconic overtones and the timelessness of the Astral.

edit: On-topic, I'm also entirely uncertain how I feel about the idea of them interbreeding with humans-- both from a biological and from a sociological perspective.