Alu-fiend

Alu-fiends are the female offspring that come from the mating between a succubus and a mortal (mostly humans). They possess some of their mother's powers, and generally appear as beautiful women with needle-like teeth and small wings. They often possess a high degree of sexual proclivity.

Rules in Successive Editions
Alu-fiends, also referred to as alu-demons, first appeared in the Monster Manual II. They were described in the Monstrous Compendium Outer Planes Appendix and the Planescape Monstrous Compendium Appendix. While their exact statistics varied slightly, the general concept as the offspring of a succubus and a mortal male remained true.

In the Third Edition rules, half-fiends were presented as a more general template, in lieu of specific entries for each instance. There has been no specific publishing of an alu-fiend template by official sources. However, a half-succubus template was included in a Dragon Magazine web article, written by Robert Wiese, on half-fiendish variety, and appears on the Wizards of the Coast website.

Alu-Fiends in the Forgotten Realms
Aliisza, an alu-fiend, appears prominently in the War of the Spider Queen (novel series), and is the main protagonist in The Gossamer Plain, the first book in the Empyrean Odyssey trilogy.

Anderia and Estellia are the alu-fiend allies of the nabassu Viscaris

Kin
The male equivalent to an alu-fiend is generally called a cambion. Successive offspring from either (with mortals) are demonic tieflings.

In 4th Edition, cambions are half-devils rather than half-demons; presumedly this would be true of alu-fiends as well, if alu-fiends existed yet in 4th Edition.