Nadox can be saved as the Leprechauns to become an ally. He is most likely one of three brothers from the legend of the Leprechauns.
First Encounter: Forgotten Pacts - Hour of Ash - Brotherly Bust-up in the Cave (DLC)
He is dressed in his own unique green version of Noble raiment and wears a top hat on his head. Also, due to his background, he is carrying a shoemaker's hammer on the back. Wether he is still a shoemaker or not is unknown.
Beginning: "I guess we're on clean up duty."
Player defeats a creature: "You seem undecided."
Player defeats a creature: "Hark on you, judge jury and executioner."
Player defeats a creature: "It's not bad being partnered up with you."
Saving an archfiend: "Hey Hey! That's against the rules!"
Sacrificing an archfiend: "Right, role of a Sorcerer and all that."
Taking minor damage: "Fiesty Bugger."
Reduced to half health: "This has gotten serious!"
Taking major damage: "Ow, it bloody hurts!"
When an Archfiend becomes enraged: "It's gotten riled now. Pull back!"
Player taking minor damage: "Are you done pissing about?"
Player taking major damage: "Bloody fool..."
Archfiend near death: "Finish it already!"