Hi! This is an incomplete masterlist trying to compile every single mob psycho omake because good lord some of these things are hard to find. Like, "end up skimming through several chapters because you vaguely remembered it being in World Domination Arc" hard to find. All of these will either be posted or reblogged here just in case the original poster happens to delete because that seems to happen a lot. They will be linked with their names and a brief description. All omakes will also be tagged with the characters present (Body Improvement Club omakes will be shortened to "body improvement club" instead of every individual character) for quicker searching.
OMAKES:
Reigen Shits Himself: serizawa asks mob to tell him about a dangerous situation he and reigen were in and mob tells the story of the time reigen shit his pants and almost got arrested
Ritsu's Nepotism: mob tries to get extra money for the body improvement club's budget
Serizawa continues to be the backbone of Spirits & Such: a lawyer appears at spirits and such and threatens to sue
Reigen needs a dog: a dog spirit attaches itself to reigen and he keeps it as a pet named "uu-chan"
The power of spider webs: mob uses his powers to stop a soccer ball midair so it doesnt crush a tulip and ritsu blames it on "really strong spider webs"
Magic > Psychic powers: mob has a dream about getting put in a fantasy world
Perseverance > psychic powers: a flashback of mob and tsubomi as kids where tsubomi keeps asking him to do difficult tasks and he keeps trying to impress her
Teaching Mob basketball > anti-terrorism: teru puts a hold on stopping psychic terrorists to teach mob how to play basketball
Reigen goes to hell, maybe: reigen gives advice to a fortune teller
Bullied & Such Consultation Office: mob and serizawa reflect on their childhood experience with bullying
Bigfoot Hunting: reigen and mob try to find bigfoot but instead find every other possible cryptid
Reigen dies: reigen nearly chokes to death
Meat: reigen takes the kids out for barbeque
Summer Vacation: reigen takes the kids to the beach
At Long Last, Revealing Their Full Name: the full names of a bunch of minor characters who didn't have them before as well as a couple biographical details for some of them
All Nighter: a scary closeup of reigen's face
Haircut Swap Series (To Not Be Continued): mob and ritsu switch haircuts
Baked Sweet Potato: mob bakes a sweet potato on an open fire
Content: mob looks at the sky because ONE ran out of ideas
Deadlines and HP: ONE tries to refill his health bar
Prime: the yokai guy tells a story because ONE was 40 minutes from his deadline and had no omake
Character Profiles: infographics sharing some fun facts (birthday, blood type, hobbies, etc) about mob, reigen, ritsu, teru, and shou
Valentines Day: the boys receive chocolate for valentines day
Lifting: tome advises mob to use his powers to play soccer
Esper Hoshino the Show Off: hoshino uses his powers to "help" his classmates
Fire Master Asahi: asahi uses his powers to light a man's cigarette
Snot Bubble: mob falls asleep and a snot bubble from his nose enters orbit
His Favorite: mob shows off his frog umbrella
Chapter 74 (unnamed?): reigen gets stressed out about his endurance being worse than mob's and tries working out
Sense of Crisis: reigen gets stressed out about mob getting stronger than him and tries working out (again)
Salt Mid Marathon Rankings: what places a bunch of characters ranked in during the 5k
Chapter 76 (unnamed?): mezato discusses with the psycho helmet cult how to find their founder
Last Nightmare: mob has a nightmare about breaking into tsubomi's house dressed as santa claus and getting arrested
Exception: the claw espers sent after mob discuss how easy he looks to kill while he flies to their location to kick their ass
Numb: teru and mob go shirt shopping
Horror Story: reigen gathers the kids to tell horror stories
Breeze: mob's umbrella gets blown away in a storm
I Understand: serizawa meets a friend from his class
Coming Up: there's a three day weekend coming up
Bug: various characters react to a bug
Reveal: edano asks how teru's hair grew back so quickly
Honesty: ritsu talks about what he wants to be when he grow up
Monkey Dream: dimple dreams about fighting monkeys
What does a ghost piggyback ride look like to people who can't see ghosts?
Greeting: Hoshino re-introduces himself for the third time
