Brown Sugar was the name Cimarron used to refer to the bartender of the brothel she lived at in 2033. It's unknown if this is his real name or just Cimarron's personal nickname.
He was described as "jowly". He first met Florence Brennan and Malte Kerzach when Cimarron brought them to her room. He later participated in the assault on the stripper mafia's hideout, wielding a double-barreled shotgun. ("CS:Under-Covered")