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Sunny Days at Fairy Tail by petrol
What if when Sunny jumped off the rooftop of the Hospital, instead of landing on the ground. He got transported to the world of Fairy Tail. But only problem is, Omori doesn't seem to be in his head anymore and whitespace disappeared. Adventures await as Sunny, his friends and the rest of Fairy Tail try and help Sunny reclaim what he lost and bring him back home.
Crossover - Fairy Tail & OMORI - Rated: T - English - Adventure/Drama - Chapters: 1 - Words: 905 - Published: 10/5 - Erza S., Gray F., Lucy H., Natsu D.
Omori: Chains Of Grief (OMORI x Chainsaw Man) by DeathlyJazzHands55 reviews
(AU) One minute, Sunny is lying in his hospital bed after his encounter with Basil. In the next, he's falling to his death, unaware as to why. The only thing he saw before he died was Omori, staring down at him with a demonic smile on his face from above. Sunny thought that he was going to die alone, and that it was all over. Little did he know, it had only just begun.
Crossover - Chainsaw Man/チェンソーマン & OMORI - Rated: M - English - Horror/Supernatural - Chapters: 3 - Words: 13,046 - Reviews: 2 - Favs: 8 - Follows: 7 - Updated: 10/3 - Published: 9/27 - OC
What is Grief, if not Devilish? (OMORI x Chainsaw Man)(OLD) by DeathlyJazzHands55 reviews
Falling from the roof of Faraway Hospital, Sunny had no idea how he got into this situation. One moment, he was in his hospital room, the next, he was falling. When he hit the floor and died, he found himself in a white space with Mari(?) Then, in the next moment, he was alive with a mission. But first, he had to know what a Devil was, and why he had chains in him. [Sunburn]
Crossover - Chainsaw Man/チェンソーマン & OMORI - Rated: T - English - Supernatural/Horror - Chapters: 11 - Words: 42,943 - Reviews: 5 - Favs: 23 - Follows: 20 - Updated: 9/27 - Published: 1/17 - OC - Complete
Sunny Drama Island by TopsyTovy
A few months after moving away from Faraway, Sunny starts falling into old habits. His mom decides to sign him up for a reality tv show so that he doesn't end up staying inside for another few years. Also on AO3.
Crossover - Total Drama series & OMORI - Rated: T - English - Drama - Chapters: 1 - Words: 3,251 - Favs: 2 - Follows: 1 - Published: 9/2
The Surface by Polarfog
Monsters are freed from Mt. Ebott by a military group. Many monsters are already free, as Mt. Ebott monsters were freed last for being known as the most dangerous monsters. Can they adjust to a society critical of their merciless killings?
Crossover - Undertale & OMORI - Rated: T - English - Chapters: 8 - Words: 8,593 - Favs: 1 - Follows: 1 - Published: 8/30 - Frisk, Sans - Complete
Pokemon in: Omori by eway4 reviews
What if Omori took place in the Pokemon world? How would the existence of Pokemon change things? Read to find out!
Crossover - Pokémon & OMORI - Rated: T - English - Hurt/Comfort/Adventure - Chapters: 7 - Words: 9,925 - Reviews: 3 - Favs: 2 - Follows: 2 - Updated: 6/10 - Published: 11/24/2022
Pokémon in: Omori how Aubrey got Nidoran by eway4 reviews
How did Aubrey get her Nidoran
Crossover - Pokémon & OMORI - Rated: K+ - English - Friendship - Chapters: 1 - Words: 1,055 - Reviews: 1 - Published: 5/23 - Complete
From Faraway to Brockton Bay by Roxsy Variant reviews
Sunny's thoughts during the drive to the city. I had the idea for a Omori/Worm crossover, I mean OMORI is about an incredibly traumatized child and Worm is about people getting powers from trauma, it was a perfect fit, so this was a relatively quick write up using the help of Ai to judge people's interest and get some opinions.
Crossover - Worm & OMORI - Rated: K - English - Chapters: 1 - Words: 1,179 - Reviews: 6 - Favs: 5 - Follows: 4 - Published: 5/14
Hands of Decay (OMORI x MHA) by DeathlyJazzHands55 reviews
[Cover Art does not belong to me, it belongs to Ddarant on Deviantart/is a place-holder for the time being] [AU is (I think) my own original idea] Premise: Sunny has an itch that just won't go away. At the same time, things start inexplicably going missing from the house. Is there a connection? Or is it just a coincidence?
Crossover - My Hero Academia/僕のヒーローアカデミア & OMORI - Rated: T - English - Horror/Hurt/Comfort - Chapters: 4 - Words: 23,892 - Reviews: 2 - Favs: 13 - Follows: 12 - Updated: 5/9 - Published: 1/24
Emotions: Aubrey's Inner Demons by DarkAttraction
Aubrey is a girl from Faraway Town who aspires to be a strong Pokémon Trainer. She takes part in the Uva Academy Treasure Hunt, getting wrapped up in the Gym Challenge, Titan Hunting, and Team Star's drama. Can she handle all of the things being thrown at her? How long before she completely snaps?
Crossover - Pokémon & OMORI - Rated: T - English - Adventure/Suspense - Chapters: 6 - Words: 13,821 - Updated: 5/2 - Published: 4/6 - Penny, Nemona, Clavell
Pokémon in: Omori! How Mari caught Flittle by eway4
How did Mari catch her Flittle?
Crossover - Pokémon & OMORI - Rated: K - English - Friendship - Chapters: 1 - Words: 512 - Published: 3/1 - Complete
Pokémon in: Omori How Basil got Flabébé by eway4
This is the story of how Basil got his Flabébé. He is 8 years old in this story. Read, Review, and Enjoy
Crossover - Pokémon & OMORI - Rated: K - English - Family - Chapters: 1 - Words: 1,037 - Favs: 1 - Published: 2/18 - Complete
Pokémon in: Omori! Valentine's Day Special by eway4
Hero and Mari are out on their journey, while their Pokémon plan a surprise!
Crossover - Pokémon & OMORI - Rated: K - English - Romance - Chapters: 1 - Words: 476 - Published: 2/14 - Complete
Pokemon in: Omori How Hero got Audino by eway4
This is the story of how Hero caught his Audino. He is 10 years old in this story. Read, Review, and Enjoy
Crossover - Pokémon & OMORI - Rated: K+ - English - Chapters: 1 - Words: 929 - Published: 1/1 - Complete
Pokémon in Omori Christmas special by eway4
Oneshot. Takes place when Hero and Mari are 12, and everyone else is 8. No spoilers for Pokémon in: Omori. Everyone is going to Mari and Sunny's place for some Christmas fun! Everyone is having a good time! Please read and review!
Crossover - Pokémon & OMORI - Rated: K - English - Friendship - Chapters: 1 - Words: 1,570 - Published: 12/23/2022
Little Dreamers by hopefulheart108
WELCOME TO... the dream? You have never been here before.
Crossover - Dreaming Mary & OMORI - Rated: T - English - Friendship - Chapters: 2 - Words: 2,081 - Favs: 1 - Follows: 1 - Updated: 12/13/2022 - Published: 12/11/2022 - Mary, Boaris
Breaking Omori by shinman45 reviews
a shitpost
Crossover - Breaking Bad & OMORI - Rated: K - English - Chapters: 2 - Words: 1,319 - Reviews: 7 - Favs: 1 - Follows: 1 - Updated: 10/22/2022 - Published: 9/5/2022
Welcome to the Underground, you have never been here before by RealEdgeQuarter
Omori had been repeating the same adventure for two whole years now. Some people might think Omori would hate how repetitive it all was, but they would be wrong. Omori loved the repetitive nature of his life since it made his job so much easier. So that’s why Omori was annoyed by the fact he fell down a mountain filled with monsters instead of going on his usual adventure
Crossover - OMORI & Undertale - Rated: T - English - Adventure - Chapters: 1 - Words: 1,900 - Favs: 5 - Follows: 8 - Published: 6/7/2022 - Chara, Flowey
Escapism by ubormaci reviews
Sunny finds a green hardcover book in a library. On the first page, it is written: "A hero is born." He doesn't want to fall back into old habits, but when fantasy is so much closer to him than ever before, he struggles. /oneshot
Crossover - SCP Foundation Mythos & OMORI - Rated: T - English - Supernatural - Chapters: 1 - Words: 1,495 - Reviews: 1 - Favs: 5 - Follows: 3 - Published: 6/7/2022
Tales of a New Headspace by FunbariVoid reviews
As Sunny says goodbye to Faraway Town, he and his mother move onto Ebott City to start a new life, hoping they can leave behind everything and finally have a happy life. But that's what they thought. Sunny, along with his mother, discovers their new home is a place where humans and monsters co-exist with each other.
Crossover - Undertale & OMORI - Rated: K+ - English - Supernatural/Horror - Chapters: 3 - Words: 2,575 - Reviews: 2 - Favs: 8 - Follows: 12 - Published: 4/3/2022 - Papyrus, Sans
Psych-OMORI-nauts: Operation Weed-Out to Sunset! by Solo Wing Greekie reviews
Raz goes back to HQ from a job and on his way, he stops in some town's pizzeria. While he's there, he notices a lot of things are wrong. And it's up to him to sort it all out. Major Spoilers for OMORI/Psychonauts 1 and 2.
Crossover - Psychonauts & OMORI - Rated: K+ - English - Adventure/Mystery - Chapters: 2 - Words: 15,091 - Reviews: 2 - Favs: 5 - Follows: 6 - Updated: 3/23/2022 - Published: 2/24/2022 - Razputin
Things Get Better (Omori X Dreamtalia) by swittrien0
Basil has gone missing. Sunny is on the search, when he hears a familiar voice, and meets up with someone who he doesn’t know at first. Soon enough, though, he realizes they actually do know one another.
Crossover - Hetalia - Axis Powers & OMORI - Rated: M - English - Hurt/Comfort - Chapters: 1 - Words: 728 - Published: 3/12/2022 - Complete
six is omori's grandchild by arson13 reviews
omori is six's bio granddad. after being reconnected with them again, things get... interesting
Crossover - Little Nightmares & OMORI - Rated: M - English - Hurt/Comfort/Angst - Chapters: 1 - Words: 2,333 - Reviews: 1 - Favs: 3 - Follows: 2 - Published: 12/30/2021 - Six, Runaway Kid, Shadow Six
Occasionally by hopefulheart108 reviews
Occasionally, Omori would see someone with him in White Space.
Crossover - Yume Nikki & OMORI - Rated: T - English - Friendship/Mystery - Chapters: 2 - Words: 691 - Reviews: 1 - Favs: 4 - Follows: 2 - Published: 12/16/2021 - Madotsuki - Complete
Paper OMORI: The Four-Year Slumber by FierySprites reviews
Okay, so hear me out: what if we take OMORI, and smash it together with Paper Mario: The Thousand-Year Door? No? Bad idea? Well, too bad, it's happening now. [Crack]
Crossover - Mario & OMORI - Rated: T - English - Humor/Parody - Chapters: 1 - Words: 2,266 - Reviews: 3 - Favs: 11 - Follows: 12 - Published: 11/15/2021 - Mario
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