CrossoverAU
Fandoms
Recent works
-
Tags
Summary
Riri had spent her whole life miserable.
At least, until she met her adopted dad, Jeno. He was a true light in her life. And so was his husband, Ender. It was a shame she didn't find them until she was 17.
Now, she's an adult, trying to figure out her role in the multiverse. That's right, apparently there's a multiverse. And both her adopted parents are varients of a skeleton called Sans. She honestly gave up trying to understand everything years ago.
From one chance meeting, she happens to run into Soul Master, a Sans with the ability to change souls into someone else's and cursed with an insatiable lust. She's hooked from the start!
Only problem is, he doesn't seem to really want anything to do with her.
- Language:
- English
- Words:
- 706
- Chapters:
- 1/?
- Hits:
- 9
-
Momento Mori (So Don't Fuck Life Up, You Don't Get A Second Chance.......Normally) by CrossoverAU
Fandoms: Undertale (Video Game)
02 Nov 2025
Tags
Summary
Momento Mori- Latin for 'remember, you must die'
What is death, if not the end of one chapter, and the start of the next. Raine is dead. She wanted to be dead. She made her bed. Cleaned her room. Said her goodbyes. And tied the noose. When that didn't work, she slit her wrists. And when that didn't work, she took her grandfather's gun off the wall and shot herself in the head. That time, she finally did something right. Now she could sleep peacefully....
Why was she awake? She was definitely dead this time, why the hell was she awake?! And is that......Sans?! As in, Sans from Undertale?! As in the game that was one of her only reasons for not killing herself in high school?! That Undertale? That Sans? Why was he multiplying? And is that Papyrus?!
Death hurts. It causes pain to those around it even when it isn't attacking them. Then it comes for them next. If she wanted to get out of the Undertale world and back to her hopefully peaceful afterlife, she would need to show some bitches that before they bled out their marrow..... all over her damn floors?! Dammit Mutt, she just cleaned those!
Series
-
Slay (SAVE) the Princess by CrossoverAU
Fandoms: Undertale (Video Game), Slay the Princess (Visual Novel)
01 Nov 2025
Tags
Summary
You are in a basement in a cabin.
That cabin is in the woods.
In the woods, on his way, is a skeleton
He is coming to kill you.
Will you let him?
-
A Remnant of Your Soul by CrossoverAU for pinkladysuicide
Fandoms: Undertale (Video Game), Five Nights at Freddy's
31 Oct 2025
Tags
Summary
Nightmare needed what this Fell verse seemed to have. His boys have worked with this one before. It seems he has a new mission for them.
Killer didn't want to leave the castle. He didn't want to go down there. He didn't want to be trapped again. But he'll do it, for his boss. Close spaces always bring out the worst in him. Especially when the people he loves are around.
Dust was stuck with the two idiots...his two idiots. Going down there. He didn't know what it would mean. But without magic, he was practically harmless. He needed them to be kept close. Kept safe.
Horror didn't know how to feel about this mission. There was something going on. He didn't trust it, and he certainly didn't trust this weird voice talking to them. That thing better stay away from his family.
Red didn't wanna do this! He just got dragged into it for no reason! Stupid Nightmare's gang. Fuck them! He could only hope he survived to see his brother again.
Aka Murder time trio and Red in sister location!!!! Because it's my love's birthday so she gets this, happy birthday, babes!
-
Tags
Summary
Fanart of things for other creators works, my own ideas, characters, and other things Undertale related!
I take suggestions!
Recent series
-
CrossoverAU needs to stop writing about their problems, they project too much by CrossoverAU
Fandom Undertale (Video Game)
02 Nov 2025
Summary
Exactly what the title says. I'm a fucked up little bitch who loves to write self indulgent fics about my issues and I need to stop. Just make sure to tell me if it starts getting annoying!
(If you're my friend, don't come here, I will cry....ok not really I probably won't know if you do, but if you do, never tell me you came here, I will be mortified, love you babe <3)
(And yes, dear reader, all of my shit includes fucked up shit from my life happening to an OC in the Undertale universes. Don't judge me, I like it)
- Words:
- 31,825
- Works:
- 1
-
Summary
Yeah, so this is just a bunch of extra stuff from Momento Mori so like one thing is gonna be the Skeleton POV, one is gonna be extra stuff, one is gonna be like alternate versions of things and so on and so forth, or it's just gonna be lumped into one big thing, I don't know yet
Love you guys!
- Words:
- 35,740
- Works:
- 3
Recent bookmarks
-
Tags
Summary
How many times will my body be burned? How many times will my bones be broken? How many times will my blood be spilt? How many times will you shatter my soul?
Frisk is done. She is done with confronting monsters, done with offering mercy, done with dodging, done with dying. She is, most of all, done with Sans’s bullshit. Her SOUL has shattered so many times; existence is fuzzy. All she wants is to go home. She used to say that she was going home if it killed her. Now she says, she’s going home if it kills them.
The anomaly. That’s what Frisk was to Sans. A pain to reset each time, and a painful reminder of how he was different. He hated her passively, an annoyence he had to deal with. Maybe he shouldn’t have been so harsh…
Everyone has sins that crawl up their own back. Everyone has wounds and scars that need to heal. Buckle up, ‘cause it’ll be a long journey.
Series
- Part 1 of Undertale Works
-
The Worst Voyage of Percy Jackson's Life (and That's Saying Something) by Forever_Fan
Fandoms: EPIC - Jorge Rivera-Herrans (Albums), Percy Jackson and the Olympians & Related Fandoms - All Media Types, Ancient Greek Religion & Lore
26 Jan 2025
Tags
Summary
Percy Jackson, age twenty-seven, wakes up in the past, in the final battle of the Trojan War. He tries to fit in and accidentally adopts a son and a new sister. Upon meeting and claiming his new sister, he makes a plan. There was a joke at Camp Half-Blood that if Cassandra of Troy met Odysseus of Ithaca, her prophecies would have been heeded as the warnings they were. If Percy was in the past for a bit, he may as well come home with an answer as to whether or not the loophole would have worked. That, and now he's committed to keeping all of Odysseus' crew alive to see their homes and families again.
Series
- Part 3 of Fics I Wrote Because No One Else Did
-
In the Language of Flowers but It’s Drawings by orphan_account for TaintedCure
Fandoms: Undertale (Video Game)
01 Jan 2023
Tags
Summary
A collection of fanart for this awesome fic!!
The completed comic has been moved to the first chapter!
Bookmarked by CrossoverAU
10 Sep 2025
Bookmarker's Notes
Beautiful art, I love the art, this art is actually so good, it's delicious, it's scrumptious, this was a whole meal, omg I love it
-
Canary by cloud_nine_and_three_quarters
Fandoms: 僕のヒーローアカデミア | Boku no Hero Academia | My Hero Academia
02 Feb 2020
Tags
Summary
Midoriya Izuku is Quirkless. Well, he thought was. That was until he opened his mouth to sing.
There is more power in Midoriya's singing than he could have ever dreamed of - a power truly worthy of a hero. But will he ever have the confidence to spread his wings and soar?Follow Canary on his journey to find his voice and become the hero he was always meant to be.
____
I thought, hey you know what would be really hard to write? A story where the super power is singing - so I did it - a story mainly about learning to have confidence in yourself and those around you
-
Tags
Summary
You spend most of your days at Ebott's aquarium. Not just because you particularly loved marine life, but to spend time with the ones you felt truly understood you.
Sure, they kill people every other week, but to be fair..
You'd probably do that too if you were kept within a glorified glass box.
- Language:
- English
- Words:
- 78,573
- Chapters:
- 33/?
- Collections:
- 1
- Comments:
- 660
- Kudos:
- 1,772
- Bookmarks:
- 333
- Hits:
- 48,343
Bookmarked by CrossoverAU
12 Jun 2025