Kneenibble, from Ultima Underworld
After the mage Anjor told the Avatar that only the former mine dispatch chamber operator Kneenibble knew the right combination for entering the Zanium mines, the Avatar returned to the Exile quarters to talk with him.
Kneenibble was willing to reveal the combination if given enough food, preferably fish, since bodies had been scarce recently and he was hungry. He was even willing to lend his fishing rod in order for the Avatar to catch at least 10. After giving him enough food, he revealed the combination that would open the gate.