Adrielix

Adrielix is the family ship between Adrien Agreste and Félix Fathom from the Miraculous Ladybug fandom.

Canon
Adrien and Félix are cousins, with their mothers being identical twins. Adrien and Félix also look nearly identical to each other, and sound nearly identical as well. As children they were said to pretend to dress up as each other, causing their parents confusion. Even Marinette, who was known to be "obsessed" with Adrien was unable to tell the two apart. It seems as though they were much closer in childhood, prior to the disappearance of Emilie Agreste.

It is revealed in season 5 that Adrien and Felix are both sentimonsters, created by their parents due to their mothers being infertile. Adrien was born out of love, whereas Félix was born out of jealousy. Félix's father resented him, calling him a monster. He controlled Félix until the day that he died, which finally broke the hold he had over him. Adrien's own father, Gabriel Agreste, continued to control him using the Graham de Vanily twin rings. Félix longs to free his cousin and to regain control over the ring that once belonged to his mother.

Félix is first introduced in season 3, coming to the Agreste manor with his mother on the anniversary of Emilie Agreste's disappearance. Adrien seems excited to see Félix, but Félix does not return the sentiments. He steals Adrien's phone, borrows his clothes, and decides to impersonate his cousin. This angers Adrien's friends, causing three of them to become akumatized. After Ladybug and Cat Noir save the day, Félix apologizes to Adrien and hugs him before departing back for London.

After seeing Adrien looking upset on television, Félix travels to Paris to try and help his cousin. He sneaks into the Agreste manor by disguising himself as Adrien, then offers to speak to Gabriel Agreste while still impersonating Adrien. Adrien agrees, but the confrontation does not go well. Later, Félix discovers the body of Adrien's mother in the crypt beneath the manor. He also confirms his suspicions that Adrien's father is Shadow Moth.

Using the Peacock Miraculous, Félix becomes Argos and creates a Red Moon sentimonster. Anyone bathed in the light of the moon disappears, a power that Félix wants to use to free Adrien from Gabriel's control. Knowing how much Adrien cares for Marinette, Félix puts her somewhere safe so that she will not fall victim to the sentimonster's power. However, Marinette transforms into Ladybug and tries to stop Argos. He causes her to disappear, and is shocked when he finds that Marinette has disappeared as well. Adrien is devastated by this. Realizing he's made a mistake, Félix calls off the power of the sentimonster so that Marinette, and everyone else, is able to return.

Félix reveals the truth about himself and Adrien to Marinette, but has not informed Adrien about his status as a sentimonster. Still, he seems to care very deeply for his cousin, even if he doesn't always understand the best way to show it.

Fanon
Félix was first introduced as a character in the Miraculous PV, who later became Adrien Agreste. Before he was officially added to the canon series as Adrien's cousin, Miraculous fans liked to present him as Adrien's older brother or twin brother, based on how much they looked alike. People had also featured the two as cousins long before the "Félix" episode aired. As he was the earlier concept of Cat Noir, some fans even had Félix as the previous holder of the Cat Miraculous before it found its way to Adrien. This idea has also been used in the "Agreste Brothers AU," as Adrien and Félix take turns using the Cat Miraculous or have Félix pretend to be Adrien, to help maintain his secret identity whenever the need calls for it.

In some fanfics and theories of what would happen to Adrien after his father was revealed to be Hawk Moth and gets sent away to prison for his crimes, they assumed that Adrien would end up moving in with Félix and his mother in London, as they are his only known relatives.

The relationship between Félix and Adrien, and Félix's character in general, was mildly received by the fandom at first. However, his actions throughout season 5 caused many to warm up to him and realize that he truly does care about Adrien. Now, Adrielix is a rather beloved relationship. As Adrien has such a terrible relationship with his father, fans were glad to see that he had a family member who loved him.

Fandom

 * FAN FICTION