Bonehilda

Bonehilda is an NPC that was introduced in Makin' Magic. There are two versions of Bonehilda in the game. One is the janitor on the Magic Town lots A Spooktacular Spot and Vernon's Vault. The other can be bought on residential lots as a magical (and much cheaper) equivalent of Servo. This version of Bonehilda is literally a "skeleton in the closet".

While the "skeleton maid" version of Bonehilda is generally equivalent to Servo, there are significant differences:

Things Bonehilda does that Servo doesn't
 * Feed a baby. Somehow, she manages to do this without waking the baby.
 * Bring in the newspaper.

Things Servo does that Bonehilda doesn't
 * Garden.
 * Attempt to entertain visitors. In fact, non-magical visitors will freak out if they see Bonehilda in action. A walking skeleton is one thing in Magic Town, and quite another in someone's home!
 * Serve food.

Misc. differences
 * Bonehilda seems to place a higher priority on repairing. She'll probably repair a broken dishwasher or sink before trying to use it.
 * Players can send Bonehilda back to her closet by clicking on her and selecting "Dismiss".

Bonehilda also has a few quirks. If a bar is present, she'll take a drink before heading back to her closet. Naturally, the drink will flow through her and leave a puddle on the floor. If tombstones are present, she may wave to one of them before going back to her closet. She is also a fan of the Grim Reaper, and will try to get his autograph if he appears while she's out of her closet.

The Sims 3
The promo page for The Sims 3: Supernatural on thesims.com suggests that Bonehilda will return and play a similar role to her role in Makin' Magic. Her Closet can be bought in Build and Buy Mode and she will act as both a Maid and Nanny.