MariaKhun

MariaKhun is the family ship between Khun Aguero Agnis and Khun Maria Jahad from the Tower of God fandom.

Anime
Aguero and Maria are two of Khun Eduan's many children, born from different, unrelated mothers. The majority of their backstory has not been revealed, but there is enough to conclude that they are currently not on friendly terms. According to Aguero, Maria was a kind and trusting woman, traits that one would say are rare in a competitive family such as the Khun's. Aguero cared deeply for her, even going as far as help Maria become one of Jahad's Princesses. However, in doing so, Aguero betrayed his own blood-family. After getting the status of Princess, Aguero was abandoned and thrown out of the Khun family since his side of the family were "failures" for bringing a woman who failed to become a Princess.

It is unknown if Maria betrayed Aguero on purpose, or if it was even her choice to begin with. After suffering a bitter betrayal, Aguero moved on and started to climb the tower. Interestingly, he doesn't seem to resent Maria in any way despite her abandoning him, as shown during the Door Test where he has a flashback of her saying "My Aguero..." and the two smiling at each other; before he's violently reminded by his mother to never trust anyone. Maria's betrayal only strengthened Aguero's distrust towards others as well as traumatized him from ever trusting anyone fully.

After Aguero was discarded from the Khun Family, the other members of the family started to spread rumors. The rumors said that Aguero and Maria might've been lovers and therefore in an incestuous relationship. However, there is no proof/confirmation they were into each other in that way, other than rumors the other members of the family spread about them.

Webtoon
On the Hidden Floor, Khun Kiseia is generated as Aguero's Sworn Enemy. As the two fight, Kiseia repeatedly reminds Aguero of how he killed their sister by helping Maria become Princess instead.

Fanon
Fanworks generally delve deeper into their backstory and are essentially canon-divergent since there is so little that is actually known about their backstories. Many like to depict Maria has an 'older sister' figure towards Aguero, especially after hearing how his mother and sister treated him. Other fanworks may highlight the parallels between MariaKhun and RachBam's relationships. Due to the canonical story, angst is a common running tag in MariaKhun fanworks.

The fandom is heavily against shipping two romantically, since they do share a father and are half-siblings. They are almost always portrayed in a brother-sister relationship or in some cases, as enemies.

It is the 10th most written relationship on AO3.

Fandom
FAN FICTION

Trivia

 * SIU, the author/creator of Tower of God, has refused to answer/avoided questions regarding the nature of Aguero and Maria's relationship. Though he has confirmed that he plans to do an Arc on the Khun Family in the future, which may touch upon it.