There are 14 NPCs that you can find in Fortnite Chapter 6 Season 2, and you should visit them in the area because you'll get some good upgrades, items and even services from them.
Skillet can be slightly tricky to find, as he is in the mines right above crime city. To get inside, head to the toilet icon on the map and you'll see the entrance. He'll sell you:
Cassidy Quinn is waiting for you in a small building next to Lonewolf Lair. Her services include:
Big Dill is partying it up on a rooftop in Crime City. Head over there to get:
Fishstick is chilling and eating popcorn at the Brutal Boxcar where you can go and talk to him. He is also next to the railroad and if you wait long enough, the Armored Train can appear, carrying some precious Dill Bits with it.
Jade is located in the beautiful flower fields. The services she provides are:
Joss can be found in the forested area of Magic Mosses. Go to her to purchase:
Keisha Cross is next to the flower fields where Jade is, so you can visit both of them if you are in the area. She sells:
Unsurprisingly, Kendo can be found in the Shogun Solitude area though he isn't very solitary. You can get these services from him:
Shadow Blade Hope is in a building in Hopeful Heights. Enter her room to get:
Sub-Zero is located in the area above Lonewolf Lair, where you want to go if you want to fight Kane and get a Medallion. Sub-Zero provides the following services:
The Brat is hanging around Kendo in the Shogun Solitude area. His services include:
The Night Rose is located at the Demon's Dojo with one other character. Her services include:
Valentina can be found in the Outlaw Oasis doing jumping jacks. Go to her for:
Vengeance Jones can be found at the Demon's Dojo with The Night Rose. If you are there, get:
If you want to know where to go in the new season, check out the New POIs and Landmarks in Fortnite Chapter 5 Season 4 on Pro Game Guides.