Pappy is a member of Big Town. He was a former resident of Little Lamplight, until forced out along with his girlfriend at the time Bittercup. She left Pappy after realising how terrible Big Town is due to constant Raider and Super Mutant attacks.
Pappy initially thinks the player arrived in Big Town to murder and steal from the residents. After the completion of the Big Trouble in Big Town quest, he is friendly towards the player and has a generally happier attitude.
Pappy can repair the players items.