Locations and quest information marked as spoilers for those who just want to check if they have unlocked all the NPCs without using a guide.

Note: All NPCs outside of The Metro require the player to speak to Connor Walker first before asking them to join The Metro.

(First name alphabetical order)

Aaron Richardson:
Location: The Metro
Quest: None
Reward: None
Vendor: Not a vendor

Benjamin Hughes:
Location: The Metro
Quest: None
Reward: None
Vendor: Not a vendor

Benjamin Young:
Location: Location: The church of RAM. Between Wellston and Rooster Ranch. Quest: Danger at the Alter. Kill 2 zombies near the church.
Reward: +2 Reputation. +50 Experience. +Benjamin can join The Metro
Vendor: Not a vendor

Brandon Callahan:
Location: Brookridge Suburbs. Inside a second story house. Hiding behind a bed
Quest: From Decay to Delay. Player must give Brandon antibiotics
Reward: +75 Experience. +Brandon can join The Metro
Vendor: Not a vendor

Connor Walker:
Location: The Metro's kitchen
Quest: Connor Needs Food For His People. Find 4 chips, 3 chocolate bars, 3 candy bars, 2 granola bars and 2 bottles of water.
Reward: +5 Reputation. +150 Experience. +1 Chips. +1 Canned Soda. +1 BLT Sandwich +Aaron Richardson joins The Metro
Vendor: Is a vendor

Cletus Johnson:
Location: The Metro's Garden
Quest: None
Reward: None
Vendor: Not a vendor

Daniel Powell:
Location: The Metro
Quest: None
Reward: None
Vendor: Not a vendor

David Collins:
Location: The Metro
Quest: None
Reward: None
Vendor: Not a vendor

Dev NPC:
Location: Outside The Metro. One by each ladder entrance.
Quest: None
Reward: None
Vendor: Not a vendor

Elliot Graham:
Location: The Metro by the tracks
Quest: None
Reward: None
Vendor: Not a vendor

Emma Lawson:
Location: Brookridge Suburbs
Quest: Courier's Guild. Deliver the letter to Emma Lawson
Reward: +$25
Vendor: Not a vendor

Ernest Mcmillan:
Location: The Metro by the barricaded entrance, up the ramp
Quest: Cheering Ernest Up. Bring Ernest 2 grape juice boxes
Reward: +50 Experience. +1 Reputation
Vendor: Not a vendor

Ethan Myers:
Location: The Metro
Quest: None
Reward: None
Vendor: Not a vendor

Evangeline Nightshade:
Location: Waterfall Lab then The Metro
Quest 1: This Just Became A Rescue Mission. Kill 15 zombies
Reward 1: +50 Experience. +2 Reputation. Nightshade can now join The Metro. Isabelle can now join The Metro
Quest 2: Supplies for Nightshade. Bring Nightshade 12 Rags, 4 Bandages, 4 Vitamins and 2 Cough Syrup.
Reward 2: +$200. +75 Experience. +1 Reputation. Unlocks Medical Shop. +Increases Shop Level. +2 Survivors
Quest 3: Infection Intervention. Bring Nightshade 3 Vaccines
Reward 3: +150 Experience. +3 Reputation. +$250. +Brandon Callahan joins The Metro. +5 Survivors

Harper Reed:
Location: The Metro
Quest: None
Reward: None
Vendor: Not a vendor

Henry Brooks:
Location: The Metro, on the tracks.
Quest: None
Reward: None
Vendor: Not a vendor

Jacon Benett:
Location: The Metro
Quest: None
Reward: None
Vendor: Not a vendor

Liam Thompson:
Location: The Metro
Quest: None
Reward: None
Vendor: Not a vendor

Martin Ballard:
Location: Withamsville Housing. Far back side
Quest: Courier's Guild. Deliver the letter to Martin Ballard
Reward: None
Vendor: Not a vendor

Mason Harrington:
Location: The Metro's Garden
Quest: Taters, Where Art Thou? Bring Mason 7 Potatoes
Reward: +$250. +25 Experience. +1 Reputation. +Unlocks Farm Shop. +Increases Connor's Shop Level. +Increases The Metro's Resistance
Vendor: Is a vendor

Max Anderson:
Location: Brookridge Apartments then The Metro

Quest 1: Proving My Worth. Kill 30 Zombies
Reward 1: +1 Reputation. +150 Experience. Mason can join The Metro

Quest 2: Anderson's Challenges 1. Kill 10 Zombies
Reward 2: +50 Experience. +1 Reputation. +Increases Shop Level. +Unlocks Throwables Shop. +Unlocks Firearms Shop. +$50

Quest 3: Anderson's Challenges 2. Kill 50 Zombies
Reward 3: +150 Experience. +2 Reputation. +Increases Shop Level. +Unlocks Clothing and Gear Shop. +$100. +1 Military Ammunition Crate. +1 Civilian Ammunition Crate. +1 Military Magazine

Quest 4: Anderson's Challenges 3. Kill 100 Zombies
Reward 4: +200 Experience. +2 Reputation. +Increases Shop Level. +Unlocks Firearms Attachments. +Unlocks Currency Exchange. +$250. +2 Military Ammunition Crates. +2 Military Magazines. +2 Grenades

Quest 5: Anderson's Challenges 4. Kill 150 Zombies and 1 Mega
Reward 5: +250 Experience. +2 Reputation. +Increases Shop Level. +Increases Metro's Resistance. +$500. +Alicepack. +2 Military Ammunition Crates. +1 Timberwolf. +2 Timberwolf Magazines

Quest 6: Anderson's Challenges 5. Kill 250 Zombies and 3 Megas
Reward 6: +300 Experience. +3 Reputation. +Increases Shop Level. +Increases Metro's Resistance. +$800. +1 Dragonfang. +1 Maplestrike. +2 Military Ammunition Crates. +1 High Caliber Ammunition Crate. +1 Military Drum. +3 Military Magazines.

Vendor: Is a vendor

Metro Guards (aka Metro's Resistance):
(No quests, shops or rewards)
Ryan Cooper, Caleb Reed, Amelia Baker, Benjamin Turner, Nathaniel Brooks, Jessica Turner, Miles Ross, Aurora Foster, Lucas Cross, Garrett Stone, and Evelyn Blackwood

Misc Survivors:
(No quests, shops or rewards)
David Collins, Liam Thompson, Benjamin Hughes, Daniel Powell, Jacob Benett, Nathaniel Harris, Micah Preston, Ava Monroe, and Felix Hawthorn

Morgan Price:
Location: The Metro's Dormitory

Quest 1: Courier's Guild. Deliver the letter to Emma Lawson
Reward 1: +$100. +1 Reputation. +50 Experience. +Unlocks Makeshift Store. +2 Survivors

Quest 2: Courier's Guild. Deliver the letter to Nolan Mitchell
Reward 2: +$100. +50 Experience. +1 Reputation

Quest 3: Courier's Guild. Deliver the letter to Martin Ballard
Reward 3: +$150. +75 Experience. +2 Reputation

Vendor: Not a vendor

Noah Sullivan:
Location: The Metro
Quest: Supply Run: Assisting Noah on the Craftmaster Path. Bring Noah 2 Blowtorches, 1 Hammer, 5 Tape, 8 Rope, 4 Wire, 3 Metal Bars and 7 Nails
Reward: +100 Experience. +1 Reputation. +$150. +Unlocks Craftmaster
Vendor: Is a vendor

Nolan Mitchell:
Location: Red apartment building in Wellston
Quest: Courier's Guild. Deliver the letter to Nolan Mitchell
Reward: None
Vendor: Not a vendor

Sebastian Goldsmith:
Location: The Metro between the kitchen and the medical shop
Quest: None
Reward: None
Vendor: Is a vendor

Travis Griffin:
Location: The Metro's Makeshift Shop
Quest: None
Reward: None
Vendor: Is a vendor