Purple Dalek

Purple Daleks were Daleks who were distinguished by their purple casings.

History
They were among the diverse range of humanised Daleks that lived on the planet Kyrol. These Daleks self-destructed en masse to save a human colony from Kata-Phobus. (COMIC: Children of the Revolution)

During the Last Great Time War, the Dalek Time Strategist (AUDIO: The Shadow Vortex) was housed in a purple casing similar to the red Supreme Dalek of the New Dalek Empire (TV: The Stolen Earth / Journey's End)

A Dalek Emperor of the New Dalek Paradigm, who appeared in an alternate 2106, was housed in an immense purple casing. (GAME: The Eternity Clock)

Behind the scenes
In a draft of Daleks' Invasion Earth 2150 A.D., the Black Dalek was replaced by a purple one.