Gypsy matchmaker

The Gypsy Matchmaker is an NPC that came with The Sims 2: Nightlife and The Sims 2: FreeTime. The Matchmaker can summon a blind date for a Sim (the Sim's compatibility with their date depends on how much the player decides to pay the Matchmaker), or sell a cure for Vampirism, Lycanthropy, Witchiness, or PlantSimism.

In The Sims 2: FreeTime, if the lifetime meter of everyone in the household is high, the Matchmaker will sneak over to the house during the night and leave a Genie lamp.

The Matchmaker is an unplayable NPC (barring hacks), but can be befriended and fall in love with a controllable Sim. However, the only socializing actions allowed with the Gypsy Matchmaker are under the Talk, Flirt and Influence menus (which is much more limited than the Influence menu of a non-NPC Sim). She will stay on a Sim's lot for hours at a time, until she is greeted.

Phone
To summon by phone, have a Sim call "Services," then select "Matchmaker."

She will arrive within 30 sim minutes. Sims can buy up to 5 potions at a time.

Trivia

 * If you marry the Gypsy Matchmaker or move her in(using cheats or mods), you will still be able to buy potions from her, even if you age her down.