Pappy

Pappy is an pessimistic NPC who lives in Big Town. He claims to have come from Little Lamplight with his girlfriend Bittercup and the others hoping to find Big Town, a nice town with plenty of food and protection. Bittercup broke up with him when they found Big Town to be a shoddy bunch of houses and junk organized into a fortress that was constantly under attack by raiders and super mutants.

Pappy is the only NPC in Big Town who can repair the players items.

Bugs
The following may not be applicable for all versions and all platforms.

When talking to Pappy, the easy speech check "I heard you came here with Bittercup" dialogue option will never disappear, giving the player a chance to earn unlimited experience and an easy way to earn the Silver-Tongued Devil achievement. However, Pappy can die after the first mutant attack if you fail to stay and help the town.