The Quasit is a lesser demon in Dungeons & Dragons born out of the Great Wheel and its excessive focus on redundancy & symmetry born from its close ties to the Alignment system. They are literally the demonic equivalent of Imps, and other than certain minutia regarding abilities and personality, they don't really have any hook to them beyond that.
We're not kidding. The quasit has literally appeared as a sub-entry for the Imp in several editions, where its fluff boiled down to "this is the Chaotic Evil version of the imp" - heck, the Planescape Monstrous Compendium Appendix literally has a quasit entry saying "As imps, only they serve Chaotic Evil masters". Even when presented on its own, it still has that same level of fluff
Quasits sit amongst the ranks of the Least Demons, albeit above cannon-fodder thralls like Manes or Rutterkin. Taking the form of small, fiendish looking humanoids with horns and long tails - unlike imps, quasits lack wings (except in 3rd edition or Pathfinder), compensating with blinding speed - quasits are slipped to the mortal realm to act as demonic advisers, spies and agents provocateur. In the mortal world, quasits work what petty evils they can; sometimes they carry out campaigns of murder and random destruction (especially since they are on the low-to-average scale of intelligence, compared to their smarter diabolic counterparts), but usually they prefer to find a bigger and more dangerous force and coax them to evil. Whilst some quasits serve as demonic advisers to evil creatures, such as drow, orcs or gnolls, their iconic trick is to seek out ambitious, foolish or already malicious mages and attach themselves to these individuals as familiars. Whilst they gladly wreak what havoc they can on the side, their main purpose is to goad their "master" into embracing evil, with the ultimate goal of snatching up their soul upon death and dragging them into the Abyss to be presented to a Demon Prince.
In general, quasits are portrayed as having the ability to radiate blasts of fear and lash out with paralytic venom on their fangs and claws, if drawn to attack, and for defense they can rely on a weak form of regeneration and the ability to become invisible. They are also shapeshifters, able to assume the form of giant centipedes, frogs/toads, bats and wolves; a quasit typically has two alternate forms. That said, the precise mechanics do vary based on the edition.
Quasits debuted in all their Chaotic Evil Imp... uh... "glory" in Advanced Dungeons & Dragons 1st edition, where they were in the original Monster Manual. They were updated to 2e as an appendix to the entries on the Imp in the Monstrous Compendium Volume One, Monstrous Manual, and Planescape Monstrous Compendium Appendix.
In Dungeons & Dragons 3rd Edition, the quasit was featured in the Monster Manual for both 3.0 and 3.5. The idea of quasits as familiars was approached in 3.0's "Tome of Blood", and in 3.5 they became part of the "Improved Familiars" ruleset in the Dungeon Master's Guide.
In Dungeons & Dragons 4th Edition, however, quasits fell by the wayside, since... well, they're kind of forgettable. The first hint of the quasit was in the Familiars system introduced in Arcane Power, where either the Book Imp familiar or the Bound Demon familiar could be flavored as a quasit. They finally debuted as monsters in the Monster Manual 3, whilst the Demonologist Paragon Path in the 4e Book of Vile Darkness gains a mandatory quasit "companion" as part of its class features.
Come Dungeons & Dragons 5th Edition, and quasits finally regained some pride by returning right in the Monster Manual - and even having their own separate entry instead of being part of the Demons entry or an appendix to the imp entry!
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Given that quasits are just a variant breed of imp, they are technically just as likely to get the sexy mini/shortstack demon treatment as their diabolic counterparts! The problem is that the name "quasit" is basically unknown outside of the halls of the D&D fanbase, so good luck finding a quasit-girl who is actually named as such instead of just being treated exactly the same as your generic imp.
That said... in the Pathfinder Adventure Path "Return of the Runelords", the players can encounter Erylium; a canonically female quasit witch who actually got art exclusively for her. Art that leaves her gender in absolutely no question whatsoever. Little demon is stacked, and wearing a slinky dress that she is basically falling out of. But then, Pathfinder does have the reputation for being sexual in a way that D&D simply doesn't.