spoilers for Drustvar story
If you mean Lucille and the Inquisitors, they’re the main characters of the Alliance story in Drustvar.
Lucille is the daughter of the second to last bosses in the dungeon.
The story of Drustvar is that a coven of witches has slowly taken over Drustvar, and people don’t know where they came from. During questing, you save Lucille, who has been accused of witchcraft and prove her innocence, and she vows to save her people from the coven. (She’s the daughter of the Lord/Lady that govern the zone)
Throughout questing, she re-ignites the Order that defeated the original inhabitants of Kul’Tiras, the Drust, long ago to defeat the Coven, and by the end of the zone, she finds out that her mother is the leader of the Coven, who is the second to last boss in the dungeon, along with her father, who was forcibly resurrected by said mother.
The last boss is the leader of the original inhabitants of Kul’Tiras, who wants revenge for his people being slaughtered by the Kul’Tirans and used Lucille’s mother to enact his vengeance.
(The Drust were evil people, they weren’t the victims, despite what Gorak’tul makes you think. The Kul’Tirans approached them in peace, but the Drust attacked them intent on killing them. The Kul’Tirans defended themselves, and a war broke out. Some Drust sided with the Kul’Tirans, the Thornbreakers, and taught them druidism. One still survives, Ulfar, and he’s the last remaining living Drust.)
When you enter the dungeon as Alliance, you get a small amount of RP between Lady Waycrest and Lucille, where she welcomes her daughter home, yadda yadda, and Lucille tells her that she will make her pay for what she’s done. (Her mother killed one of her dear friends at the end of Drustvar questing)
At the end of the dungeon, as Alliance, Lucille asks Alliance for their help to stop Gorak’tul from getting back into the world.
As Horde, as you know, they say something like, “Who are you?” and Lucille simply goes, “It doesn’t matter, please, help us!”