The Collector

The Collector was an Usurian.

Biography
Aided by his human assistant Hade, the Collector oversaw operations in Megropolis One on Pluto. The Usurians' Company had, by this time, made Pluto into a world inhabited by humans who lived in cities lit by six artificial suns. In his native form the Collector resembled kelp. He maintained a humanoid form on Pluto.

When the Fourth Doctor reprogrammed the Company computer to apply a 2% growth tax, indexed, the loss of profits so upset the Collector that he reverted to his native form and was imprisoned with a champagne cork. (TV: The Sun Makers)

Titles
Gatherer Hade used the various terms to address the Collector, all prefaced with the word "Your" and often intended to imply a greater size than the Collector's full stature suggested: "Highest", "Sublimity", "Eminence", "Elevation", "Pinnacle", "Colossus", "Hugeness", "Amplification", "Vastness", "Voluminousness", "Globosity", "Mightiness", "Magnificence", "Immensity", "Sagacity", "Omniscience", "Supernal Eminence", "Corpulence", "Promontory", "Omnipresence", "Aggrandisement", "Grossness", and "Orotundity". It was never specified if the Collector explicitly wanted to be addressed as such or if he just tolerated Hade's attempts to flatter him. (TV: The Sun Makers)