In this universe the True Cross requires every demon or nephilim in the Order to become a familiar to join, and even the Demon Kings are not an exception to this. Mephisto has refused this rule for years, but this leaves him unable to get his claws as deep into the Order as he wants. So when Shiro comes to Mephisto with Satan's children, the details of his favour change slightly.

Darkness was all Ming Xia knew. For so long she searched and searched, desperate for something to keep her together. It didn't matter really who or what, just so long as the pain and sadness went away. When she picked up that infant covered in azure flames, she was happy. This child, regardless of bloodlines was Hers! Damn anyone who says otherwise. You don't mess with Mama.

Rin Okumura had a strange vivid nightmare of the future. With a new kid joining the class and the looming dread of the apocalypse. It's up to Rin and his friends to figure out a way to stop the end from happening. Any means necessary.

Als die acht Dämonenkönige auftauchen, geht alles drunter und drüber. Während der Vatikan alles für einen schlechten Scherz hält, wird Rin von ihnen nach Gehenna geschliffen. Dort muss er erkennen, dass nicht die Dämonen die Feinde sind und findet sich im Kreuzfeuer eines uralten Konflikts wieder. Eine den Exorzisten unbekannte Feindin bedroht beide Welten und sinnt auf Rache...

A young angel named Kuri has been targeted by demons from the moment she turned 16 due to a luring scent she possesses. Scheming Mephisto puts her and her fox demon familiar under the care of the Okumuras, making the brothers their bodyguards. But can Rin resist the lure of the young angel who loves demons?

Un trato que pondrá a prueba el concepto de amistad.

Rin discovers something very important about Amaimon.

Una hermosa camelia roja tiene una misión; proteger a un Nephilim engendrado a partir de las brasas y el odio de una mujer abusada. Ella se juró que ni las bestias de Gehenna, ni el Vaticano le harían daño a la niña, sin embargo ¿Cuál es el costo? Uno muy grande que está dispuesta a pagar, aún si debe ser la marioneta del libertino. No importan cuántos pétalos le arranquen. [OCs]

Getting a new apartment seems to crack both of the brothers. Rin just can't keep his hands away from Yukio and Yukio's walls crumble from being pushed to the limit so many times when they were younger. As the brown haired boy is pinned against the car with his twin brother so close, his dam breaks and nothing will go back to normal afterwards. ((((Completed on AO3))))

Rin's body has gone into overdrive after his ill-timed heat, leaving him tearing apart at the seams trying to contain the energy he's absorbed. Unfortunately, the rut he's fallen into now doesn't care about the damage it's causing, and he has to hope he can ride it out before he burns from the inside. And Mephisto can only hold Yukio off so long.

Melody, an exorcist in training appears at True Cross Academy claiming to be the daughter of Mephisto, after confirming the story the Demon Lord himself seems to have plans for his estranged daughter.

Clover was raised in the world of exorcists. They grew up and chose a modest path in life, and all was peaceful until their mysterious past came back to haunt them. Will our nonbinary hero overcome the challenges and dangers that lie ahead? All is to be revealed! OC-centric AU

Alia Tanaki is a socially challenged atheist that doesn't believe in the supernatural, but her wealthy, Catholic parents plan to change that by shipping her to True Cross Acadamy until her world falls apart. When Alia sees something she shouldn’t have in the Okumura dorm, she blackmails Rin to be her test subject in exchange for her silence. Can Rin keep his true identity a secret?

No one ever said being the son of Satan was easy. Especially when more of your demonic siblings start showing up and won't leave you the hell alone! Rated M for language and mature themes. OC-Demon Kings. Canon compliant up to chapter 68 of the manga. After that, total AU. Contains spoilers for later chapters. See authors note, prologue

Angel was only ever a sacrificial lamb, and some timelines lead him there sooner than others. Samael indulges. *Warning: Dead Dove Do Not Eat

Rin gets attacked by a demon and transforms into a girl. Based on the hentai" Kuro Gal ni Natta kara Shinyuu to Shite Mita "

What happens when Rin isn't the only one with magic? What happens when most exorcists have some kind of magic? What if dragons existed? There are many changes from the original, you could choose to look, or you could choose not to. It's all up to you. Many powerful mages will fight alongside the Blue Warrior. Will you be one of them? SYOC Dragon rider AU Magic AU

A misunderstanding sparks in Cypress the power to watch the path of magic. Through training and effort, he gains respectable power not through Demons but the gods of old, the power of the Earth and the Soul, and through it he protects himself gaining the attention of the Exorcists. Forced into their training, he struggles to find peace under their bias.

Samael goes to meet a new addition to the family and learns something very interesting. [First meeting between Mephisto aka Samael and Azazel. Inspired by the manga]

Rin and Yukio are sent on a mission to discover a secret sanctuary for demons, created by a "fallen priestess." When they arrive, they meet an angelic priestess (irresistible to Rin) and her sister (and familiar). The demon responsible throws them into chaos, separating Rin from his brother and staining their lives with blood.

A dying girl's wish summoned a being that surpassed even the most fearsome evil creatures into this world. What is she really seeking in Assiah? Short prequel to a WIP fanfic.

*Set in Chapter 34 or Season 2 Ep 12 in the Anime* Shura wants to know what Mephisto is planning to do with Rin and he gets her to drink with her...

Rin es dejado, solo o herido, con el mismo poder que usa para salvarle, ahora teniendo que luchar contra él. Yukio y los demás tienen que encontrar algún modo de ayudarle antes de que las llamas y, quizás, alguna misteriosa enfermedad alejen a su hermano de él. TRADUCCIÓN NO AUTORIZADA

From the dawn of time, Lucifer had been alone. Until he wasn't.

A collection of disconnected shorts taking place in the "Blue Exorcist" universe. Update: In the weeks that followed Father's passing, an urge possessed Yukio to search for something. He scanned his texts. Listened to occasional voicemails. In all these communications, he couldn't find the words "I love you".