Registering friends let you earn Perk Points to be used to purchase Perks. These are permanent combat bonuses applied to your character. You'll earn one Perk Point after reaching the required number of friends. You can only select a limited number of perks so carefully choose the ones that will benefit you the most. This will usually depend on your playing style and sometimes, the created character's class.
You can register a total of 121 friends but only 120 will be displayed. This is because Clyde, who you can register at the start of the game will unfriend you as the game progresses. Some friends can be added by simply talking to them while others can be unlocked after completing various quests and sidequests. Some friends are also missable since the only time you can register them is limited only during a specific quest. Missable friends will be listed in red font so take note of their locations and their requirements for registering them.
Al Gore
You can find him hiding behind a tree beside the cinema.
Allie Nelson
After completing the quest "Recruit the Girls", talk to her while you're inside the Sparkle Chamber. She's sitting to the upper left part of the room.
Amber
Found stuck on a tunnel west of Mr. Hankey’s home.
Annie
Rescue from the bullies in front of the town hall
Bartender
Complete “Rats in the Cellar” sidequest
Bebe
Complete the quest “Recruit the Girls”
Big Gay Al
While exploring Mr. Slave's intestine in the quest “Beat Up Clyde”, you'll find a smartphone along the way. When it rings, answer it by pressing the main button to register Big Gay Al to your friends list. Failing to answer this will miss your chance in registering him as friend. You have to load the checkpoint save to go around this.
Bill
Found along the corridor on the second floor. Help them during the quest “Attack the School”
Billy
Complete “Hide n' Seek” sidequest
Bishop of Banff
After defeating him in battle, he'll ask you to spare his life during the quest “O Canada”. Comply and he'll be added as your friend. Kill him and you won’t be able to get his friend request.
Bradley
He's hiding in the bushes west of Kyle's house. You have to shrink your size and enter through the small hole in the bushes.
Butters
Your very first friend. You’ll meet him as soon as you leave your house.
Cartman
If you sided with the humans, you'll register him as friend during the quest "Attack the School". Otherwise, he'll be added as a friend after an alliance has been formed between the two factions.
Catatafish
Disarm the snuke inside Mr. Slave's *** in the quest “Beat Up Clyde”.
Chinpokomon Toy Corporation
Automatically added after collecting all chinpokomons. There are missable chinpokomons so if you failed to complete the set, you won't be able to add this to your friend list. Refer to the Chinpokomon page to learn the individual locations of each chinpokomons.
Christmas Critters
Beary, Rabbity, Skunky, Beavery, Mousey, Squirrely, Deery, Woodpeckery, Porcupiney, Foxy, Chickadee-y &Raccoony
Go the Lost Forest and follow these directions: right, up, right, down, right to find them. Accept your lord savior to add them.
Chris Donnely
After the two factions have joined forces, talk to him again in the Elven Kingdom.
Clyde
Talk to him as soon as you’re inside Kupa Keep. If you fail to befriend him during this time, you may not be able to befriend him anymore as the story progresses.
Craig
Complete “Detention Sentence” quest
Cornwalis
Rescue him from the hobos in the sidequest “Dropping the Kids Off”
Crab Person
Go to the cavern under the town and break down the rock covering the path leading to him using Nagasaki.
Dad
Talk to him once you've acquired at least 50 friends.
Damien
Talk to him inside the cinema.
DogPoo
Complete the sidequest “Restoring the Balance”
Dougie
He’s hanging outside Butters' house. You can register him as a friend very early in the game. He will disappear from his spot as you progress in the story.
Douglas
He is hidden in the second floor of the building next to Photo Dojo. Shoot the cracked window on the second floor to reveal the alien device. Teleport yourself on the second floor to find Douglas.
Duke of Vancouver
After receiving a letter from the Princess of Canada, head to Vancouver and simply talk to him.
Earl of Winnipeg
While doing the quest “O Canada”, he'll order you to slay three dire bears in Winnipeg. Report to him once this task is done.
Esther
First, find the Newsroom Key inside the Post Office. Enter the Newsroom and talk to the girl sitting on the chair.
Father Maxi
Complete “Find Jesus” sidequest
Filmore
Complete “Hide n' Seek” sidequest
Flora
Complete “Hide n' Seek” sidequest
Fossey
Found along the corridor on the second floor with Bill. Help them during the quest “Attack the School”
Francis
He's found building a snowman right next to the Broflovski residence. Destroy the snowman to register him as friend.
Frog King
Successfully disarm the snuke inside Mr. Slave's *** in the quest “Beat Up Clyde”.
General Disarray
He's found inside Professor Chaos' Lair. This is a storage shed in U-Stor-It. First, you need to get the Chaos Lair Key from Butters' room. During your first visit to U-Stor-It, the gate will be closed. To get inside, hit the ladder above the dumpster beside the hobo/street merchant the climb on the advertisement board. Once inside, head north then east and open the storage door to the far side.
Heidi
After completing the quest "Recruit the Girls", talk to her while you're inside the Sparkle Chamber. She's standing on the right side of the room.
Henrietta
Complete the main story quest “Nonconformist”
Ike
During the quest “Beat Up Clyde”, you'll reach the part where you have to turn the wheels on the two towers. As soon as you start this section, Ike will get hit by an enemy cyclops. Blow him up by farting on the firecracker Ike lit up. Doing this will knock him down and make Ike your new friend.
Jason
Her runs the Elvenwares shop in the Elven Kingdom. Talk to him as soon as you enter this area.
Jenny
Complete “Hide n' Seek” sidequest
Jessie
After completing the quest "Recruit the Girls", talk to her while you're inside the Sparkle Chamber. She's located beside the chest to the left.
Jessica Rodriguez
She'll be added during the quest “Unplanned Parenthood”
Jesus
Complete “Find Jesus” sidequest
Jimbo
Complete the sidequest “Big Game Huntin' with Jimbo”
Jimmy
Complete the sidequest “Magical Songs”
Karen (McCormick)
Inside Kenny's house
Kelly Gardner
Talk to her, she in front of house 1890.
Kelly Rutherford
On a bench west of your house. You should have at least 20 friends to befriend her. Take note that she will disappear from her location as you progress in the game.
Kenny
Complete “Flower for a Princess” sidequest
Kevin Stoley
Complete “Vulcan Around” sidequest
Kyle
If you sided with the humans, you'll register him as friend during the quest "Attack the School". Otherwise, he'll be added as a friend after an alliance has been formed between the two factions.
Lemmiwinks
During the quest "Attack the School", enter the Fifth Grade classroom. This is right beside the Fourth Grade classroom where you'll confront either Kyle or Cartman in the last part of the quest.
Leroy Mullins
On the rooftop of the newsroom. You have to enter the vent to the right side of the room in gnome size. (You'll pick up the Accountafish Chinpokomon along the way) then climb up the pipe
Lola
Talk to her in the post office once you've gathered at least 40 friends.
Mayor McDaniels
Complete the sidequest “The Homeless Problem”
Michael
Complete the main story quest “Nonconformist”
Millie
Destroy the snowman beside the photo-dojo to go around the building and talk to her.
Minister of Montreal
Rescue him during the quest “O Canada”
Mom
Talk to her on your first day.
Monica
Defeat her bf during the quest “Pose as Bebe's Boyfriend”
Mr. Ardler
Talk to him in the Community Center after completing “PTA Problems”
Mr. Broflovski
Talk to him outside his house.
Mr. Garrison
Talk to him in the Community Center after completing “PTA Problems”
Mr. Hankey
Complete the sidequest “Dropping the Kids Off”
Mr. Hat
You'll find it along the way while exploring Mr. Slave's intestines in the quest “Beat Up Clyde”. It will be added immediately as you run into it.
Mr. Kim
Complete the sidequest “Mongolian Beef”
Mr. Mackey
Complete the sidequest “Wasted Cache”
Mr. McCormick
Destroy the garbage bags beside Skeeter's Bar.
Mr. Slave
Complete the sidequest “Mr.Slave’s Package”
Mr. Stotch
Talk to him inside their (Butters) house.
Mr. Tweak
Buy a Speed Potion Ultra from their shop.
Mrs. Biggle
She's sitting on a bench outside the Post Office. She will disappear from this spot as you continue with the story.
Mrs. Broflovski
After completing “PTA Problems”, talk to her in the Community Center
Talk to her in the Community Center after completing “PTA Problems”
Mrs. Cartman
Talk to her inside her house.
Mrs. Hankey
Complete the sidequest “Dropping the Kids Off”
Mrs. Marsh
Buy something from her in Tom's Rhinoplasty. Procedures don't count towards this.
Mrs. McCormick
In the kitchen of Kenny's house
Mrs. Stotch
Talk to her inside their (Butters) house.
Mrs. Tweak
Buy a Speed Potion Ultra from their cofee shop
Ned
Complete the sidequest “Big Game Huntin' with Jimbo”
Nelly
After completing the quest "Recruit the Girls", talk to her while you're inside the Sparkle Chamber. She's located beside the chest to the left.She's the one sweeping the floor.
Officer Barbrady
Outside Tom's Rhinoplasty
Pete Melman
Found in the attic of the garage beside house 2210. Shoot the ladder inside the garage to reach him.
Pete
Complete the main story quest “Nonconformist”
Philip
He will be automatically added with Terrance after they teach you Nagasaki during the quest “O Canada”
Polly Prissypants
Set Cartman as your buddy then iInteract with the doll in his bedroom.
Prince of Canada
After defeating the bishop, report back to the prince during the quest “O Canada”
Princess of Canada
Rescue the minister in the quest “O Canada”
Principal Victoria
After completing “PTA Problems”, talk to her in the Community Center
Talk to her in the Community Center after completing “PTA Problems”
Quaid
Complete “Hide n' Seek” sidequest
Randy Marsh
Free him from captivity as part of the quest "Alien Abduction".
Red
Complete the quest “Recruit the Girls”
Romper Stomper
He's locked up inside the jail. To free him, you have to find the jail cell key inside the police station's locker room on the second floor. Talk to him after opening the cell.
Sally
Complete “Hide n' Seek” sidequest
Santa
Use the alien probe to teleport to the police station’s rooftop. You'll immediately find him there.
Scott Malkinson
Talk to him as soon as you’re inside Kupa Keep
Sergeant Yates
Complete the sidequest “Nazi Bounty Hunt”. This sidequest becomes available when zombies have started ravaging the town.
Shelly
Talk to her after defeating her in the quest “She-Ogre”
Simon
Rescue him from the ratsin the sidequest “http://www.supercheats.com/south-park-the-stick-of-truth/walkthrough/dropping-the-kids-off”
Skeeter
Complete “Rats in the Cellar” sidequest
Sparrow Prince
Successfully disarm the snuke inside Mr. Slave's *** in the quest “Beat Up Clyde”.
Stan
Complete the sidequest “She-Ogre”
Terrance
He will be automatically added with Philip after they teach you Nagasaki during the quest “O Canada”
Timmy
Complete “http://www.supercheats.com/south-park-the-stick-of-truth/walkthrough/the-timmy-express” sidequest
Token
Complete the “Gate Crashers” quest
Tweek
Complete “Hot Coffee” quest
Underpants Gnome
Complete the sidequest “Phase 1”
Wendy
Complete the quest “Recruit the Girls”
Polly Prissypants is also missable! Just make sure to find her before you finish the game.
You can get Miss Prissypants after the game.