In Jewish folklore, lilin (or lilim) were dangerous creatures. They were said to be the children of Lilith by Samael, the angel of death. They are demons and are similar to succubi. Men feared the lilim for this reason and women also feared the lilim because it is believed that they kidnap children like their mother Lilith.
"The name for the daughters of Lilith, the first wife of Adam of the Old Testament of the Bible. They are amazingly beautiful and strongly resemble their mother. The Lilim are said to bring harm to human children, and to seduce men who are caught in their gaze. They are often identified with succubi, and also with the Empusa of Greek mythology."
—Shin Megami Tensei IMAGINE Compendium
Lilim appear as support for Succubus in Shinjuku Babel's docks area and at night in Ikebukuro. They appear as enemies within the Hacked Chip μ instance. It is also possible to obtain a variant with an alternate appearance through a special double-fusion of Lilim and Alp with a plug-in obtained by turning in Essences of Yetzirah to the researcher in Babel's Cathedral. This variation is called Lilim the Little Demon.
"A demon in female form from Judeo-Christian lore. Said to tempt sleeping men and attack infants. Daughters of the demoness Lilith who tempted Adam; like their mother, they drain men of their essence."
Lilim is the first Persona of the Moon Arcana. It wears a different outfit from its demon counterpart along with crimson wings and tail. The Persona's stats grow evenly as it ranks up and if returned to the Velvet Room at MAX Rank, it will yield a Nerve Stone.
The demon encountered in dungeons can be something of a danger due to its use of the Mudo spell and Charm status effects. Lilim begins appearing in the basement of the SEBEC Building.
Lilim is the lowest level Persona in the Devil Arcana. She is necessary to fuse Alice. Of note is a popular fusion that gives Lilim access to Agi, Bufu, Garu and Zio spells at the same time. By fusing a Pixie and Nekomata for a Forneus with Bufu (A fused or leveled up Forneus must be used for Lilim to inherit two skills), then fusing it with an Angel with Garu, then fusing the two together creates a Lilim that inherits Garu and Bufu (Lilim starts with Zio and Agi naturally).
"A demon in female form from Judeo-Christian lore. Said to tempt sleeping men and attack infants. She is the daughter of the demoness Lilith who tempted Adam. Like her mother, she drains men of their essence."
Lilim is one of the demons summoned by Hinako Kujou, and appears to be her demon of choice. Hinako orders her to catch Keita Wakui as he falls from the stairs in Festgate, "averting" his Death Clip. She then helps fend off the demons as the party searches for the hacker.