Nymph
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Nymphs are a species of female spirits originating from Greco-Roman mythology and one of Western culture's earliest forms of monstergirls. Distantly related to the gods, but far less powerful, nymphs are spirits tied to various aspects of nature - their most common subdivisions being the famous Dryads (tree spirits) and less famous but still somewhat recognizable Niads (spring & river spirits) and Oceanids (ocean spirits), but there are many, many others, including Oreads (mountain spirits), Limoniads (meadow spirits), Limniads (lake/marsh/swamp spirits), and Napaea (valley & glen spirits). Nymphs are particularly known for being pursued by amorous menfolk, from humans to satyrs to gods.
Though the name is taken from Western culture, the concept of "beautiful female spirit" is pretty universal, and beings akin to nymphs show up in almost every polytheistic mythos.
Despite this, nymphs have never really enjoyed a lot of attention in /tg/ related works, simply because the concept is both extraordinarily broad ("nymph" can, realistically, refer to any beautiful female fey, from an elf to a mermaid) and surprisingly weak - a nymph is basically just a super-beautiful "non-human, but doesn't look it" woman.
Dungeons & Dragons has traditionally included nymphs over multiple editions, but they're not really acknowledged much, simply because they're obvious fapbait and, unlike the succubus or lamia, they don't really have anything to distinguish them beyond that. Your D&D nymph is basically a high level, max charisma, female elf sorceress with one unique ability: if you see her naked, you gotta make a save to avoid dying, and then another save to not go blind if you live. Apparently because they're "so beautiful".