I'm currently running a pathfinder campaign and one of the new players really want to play a Half-Efreet, this blend would actually fit quite well into my campaign but it seems a little challenging to create such a race and still try to keep it on a level adjustment +0.
The nature of the Efreeti themselves could even be too alien to produce any living half-human offspring, on the other hand an efreets magical nature might be the key. It could also be the result of horrible magical experimentation. Well I need a few ideas so if you have any ideas as to how and why it is possible to mix efreeti and humans please feel free to comment :)
I was thinking of giving the Half-efreet some fire resistance and vulnerability to cold. I also think giving it a +2 to a random stat like most crossbreeds with human blood. Maybe a few insignificant spell like abilities like the Gnomes ''Gnome Magic'' with a fire twist if possible.
It's really hard to produce a hybrid when the act of mating is likely to set one part of the couple on fire.
Cast Energy Resistance Fire?
Presuming they're both consenting, the non-efreet can wish that the female is pregnant with their child, and the efreet won't misconstrue the wish.
As for the race, I know the Qadira book has a half-Jann race, which would be a good starting point for you.
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In most D&D ish worlds anyway.
You can find stats for them in a number of places, including the 3.5 Forgotten Realms setting (I believe they first showed up in AD&D Planescape).
Someone attempted a Pathfinder version here. I agree with a commenter about raising the fire resistance and dropping the boost to saves.
If you don't like that precisely, it should be at least a good starting point.