Kandyman

The Kandyman is a twisted robot created on a colony where unhappiness or sadness is a crime. This stupid philosophy was abandoned not long after the Doctor (and Ace) arrived at the colony and whacked some sense into the colonists with his question-mark umbrella, but the Kandyman refused to give in so the Doctor doused him with lemonade and he seized up.

He was dumped into outer space from a garbage hauler but survived his apparent death, only to go on to secretly take over the Intergalactic Confectionary Corporation. With the Kandyman as their leader, the ICC became a dominant galactic sweet-manufacturer and the flagship of its fleet, the ICC Wonka, was renowned as one of the biggest confectionary hauling tankers in the universe. The Reapers and the Covenant hate the Kandyman as he is always biased towards Humans, giving them the best sweets.