|The Jitter Girls|
|Magic||Unknown (both original magic and current magic)|
The Jitter Girls are sisters and a group of villains that appear in Death Bringer. Not much is known about them besides the fact that they give Valkyrie and Skulduggery a rather hard time, and they probably would have killed them both if one of them had not caused Valkyrie to change into Darquesse. It is indicated that they are incredibly powerful, as even China Sorrows expressed her surprise when she was informed that Skulduggery and Valkyrie had managed to defeat them. Derek, the author of the series, has confirmed that there are only 3 Jitter Girls.
The Jitter Girls are six year old Triplets possessed by a dark being at a young age in the 1930's. The dark being was said to have tried to sneak into this world through their minds, planting a "seed" in them. It is said to have probably not been a Faceless One . They were thought to be possessed by the devil and Skulduggery was called in, but couldn't help. They died in an asylum. However, they returned to life and now live in a box.
When Skulduggery Pleasant and Valkyrie Cain go to Bernadette Maguire's house to interview her, they find out she has been recently killed using Adept magic. A mysterious man, who is later revealed to be the necromancer Bison Dragonclaw then brings a box containing the Jitter Girls to dump in the house to cover his escape.
The Jitter girls trigger Valkyrie's turning to Darquesse, although this lasts periodically due to the fact one of the Jitter Girls was attempting to root through her brain and most likely, kill her.
[[The Dying of the Light]
Skulduggery mentions them as an example of a magic that Sorcerers have very little understanding of.
- Derek Landy came up with the idea of "the Jitter Girls" 10 years ago as part of an unmade script he did, which is also the same place as where he came up with the Cleavers.