Alice (The Scorpion and The Frog)

Alice was a thief employed by Barthamus, and specialized in safe cracking.

History
At some point in the previous 10 years, Alice sold her soul to Barthamus, for unknown reason. In exchange for Barthamus not collecting her soul, Alice would put her skills to use for him. Later, she assigned a job with Grab to steal Barthamus' bones from Luther Shrike.

Season 13
The Winchesters meet her first time in a factory, when they were briefed by Barthamus about a plan to heist Luther and reclaim his belonging.

Sam under guise as a supernatural collector, was able to infiltrate Luther's property and placed Dean and Alice, which further summoned Grab. They managed to make it to his vault. However, Luther sensed their activity and compromised Sam. After a short fight, he managed to go to his vault room and killed Grab.

While Alice fled the scene, Dean later managed to combat Luther and succeeded to defest him. Alice trying to escape Luther's house, only to be caught by Barthamus. Barthamus later appears outside of Luther's house to force Alice to keep helping following the death of Grab.

After managing to disable Luther's darts booby trap, and thanks to Alice's safe cracking skills, Sam, Dean, and Alice managed to stole the cache. But Luther was able to escape the scene and later ambush them with his truck, the car chase ensued. Sam later shot the truck's tire, disabling it.

Moments after the Winchesters and Alice learn the truth from Luther, Barthamus appears and decapitates Luther with a machete, stating that Luther never should've left his house. Barthamus tells the shocked Winchesters that Luther had it coming and dismisses letting Luther's son die as the "fine print" that Luther never read. Barthamus pays Alice with a roll of cash and offers the Winchesters the second half of the Nephilim tracking spell. However, disgusted with what Barthamus has done, the Winchesters both refuse to trade Barthamus' bones for the spell.

With the Winchesters refusing to cooperate, Barthamus takes Alice hostage to "reopen negotiations." Barthamus demands that the Winchesters turn over his bones in exchange for Alice's life, promising to "snap her neck like kindling" if they try to burn his bones and kill him. The Winchesters reluctantly slide Barthamus' bones out and Barthamus sends a terrified Alice out to retrieve them, disapprovingly stating that the Winchesters could've had the spell but they "couldn't make it easy."

Barthamus watches in amusement as Alice apologizes to Dean who tells her to "take care of you" and gestures to Barthamus' bones where Dean has left his lighter. Not noticing this, Barthamus orders Alice to hurry up. Alice walks over to the bones, then, as Barthamus watches on in shock, uses Dean's lighter to set them on fire. With a scream, Barthamus catches on fire and burns to ash along with his vessel, killing Barthamus. The fire from Barthamus' death ignites the tracking spell, destroying it as well.

She later transported to the nearby bus station and the Winchesters buy her a ticket to unknown destination, but safe enough, so she won't be pursued again.

Appearance

 * Season 13
 * The Scorpion and The Frog