Padishah Emperor Shaddam Corrino IV, Emperor of the known universe.

From the novel:
"The Emperor stood poised, waiting -- a slim, elegant figure in a gray Sardaukar uniform with silver and gold trim. His thin face and cold eyes reminded the Baron of the Duke Leto long dead. There was that same look of the predatory bird. But the Emperor's hair was red, not black, and most of that hair was concealed by a Burseg's ebon helmet with the Imperial crest in gold upon its crown."

The Emperor look is designed to have a military look, as the book describes, but with a Middle Eastern flare, due to the subtext of the Dune novel for the Middle East. The Emperor is dressed in the colors of house Corrino, Crimson Red, and is adorned with the house seal, the Golden Lion. The Emperor comes with ceremonial curved golden dagger.

Princess Irulan Corrino, daughter of the Padishah Emperor

From the novel:
"And among the lackeys stood one of the Emperor's daughters, the Princess Irulan, a woman they said was being trained in the deepest of the Bene Gesserit ways, destined to be a Reverend Mother. She was tall, blonde, face of chiseled beauty, green eyes that looked past and through him."

Irulan comes in regal imperial gown in the house color of crimson. She wears a simple golden crown, but is adorned with the golden head frame.

Reverend Mother Gaius Helen Mohiam,  Emperor's Bene Gesserit Truthsayer

From the novel:
"The old woman was a witch shadow - hair like matted spiderwebs, hooded 'round darkness of features, eyes like glittering jewels." And "she has scrawny hands and a black aba robe with drawn hood." And "Her face peered out of the hood like a witch caricature - sunken cheeks and eyes, an overlong nose, skin mottled and with protruding veins."

The Reverend Mother is wearing the black robes, as described in the book. She comes slumped and hunched over with interchangeable hands; one hand in a plain shriveled hand & the other holds the green box of pain to test young Paul Atreides.