Rheen the Powderizer, often referred to as Rheen, was a gladiator droid that had been upgraded. Its form was humanoid, featuring a slender head equipped with an antenna, a sizable armor plate protecting its lower torso, and a single armor plate covering its right shoulder. The limbs of the droid were quite slender, with the exception of its forearms, which were significantly more substantial.
The droid participated in a Pit Fight Night event at Grakkus Arena, a gladiatorial arena belonging to the Hutt Grakkus Jahibakti Tingi located on the moon of Nar Shaddaa, sometime between 10 BBY and 3 ABY. A proposed advertisement was submitted to Grakkus for his approval, outlining a fight between Rheen and the modified B2-series super battle droid named Sallowpink, where all weapon modifications were permitted, as the feature attraction of the night's program.
The first mention of Rheen occurred in the 2018 sourcebook Star Wars: Smuggler's Guide, authored by Daniel Wallace, which included an illustration of Rheen created by Adrián Rodriguez.