Muzan Kibutsuji (shadow AU) [4].

Muzan's personality.

Muzan was callous, ruthless, and exceptionally intelligent. He sees no value in any human he has ever encountered and shows little value in his own subordinates. Rarely upset or happy visually, he appears completely drab and aloof on most occasions, even when he is cruelly murdering his own subordinates. The only times he shows emotion is when his vision of perfection advances or when his subordinates completely submit to his will. But after he accidentally became pregnant with what was apparently a dark spirit that had been imprisoned in a haunted wooden box hidden in an old temple, Muzan began to become quite fearful and overprotective, fearing everything and everyone, fearing for his own life and that of his baby even though deep down he knew perfectly well that it was an evil being.

Muzan's physical appearance.

Muzan has the appearance of a young man whose age is around 20 years old; he has short hair styled in curls with some strands hanging on his forehead. Like all Devils, Muzan has eyes similar to those of a feline, in his case, plum-red in color and the nails on his fingers are pointed and blue. When he was a human, Muzan dressed in the style of the Heian Era using a traditional hitatare, had longer hair reaching the small of his back and his eyes were completely lacking in brightness. But as her pregnancy developed, Muzan began to wear less extravagant and more comfortable clothing for her state of pregnancy, mainly wearing kimonos that tied above the chest so that it would not bother her as much.

Yoriichi's Personality (Own AU)

Yoriichi, although he is largely calm and reserved, hides a great secret and that is that his soul was corrupted and he became a shadow angel, he became sadistic, indifferent and cynical but he masks it perfectly in addition to being very possessive with Muzan, who is pregnant by a shadow angel, Yoriichi got to the point of chaining Muzan to a bed on his estate solely to prevent Muzan from trying to escape before giving birth since shadow angels are very territorial with the young of their own species.

Backstory(Own AU)

When the demons appeared on Earth so did beings similar but not equal to them, the shadow angels, souls that were corrupted by resentment and sadness, most of them victims of demons directly or indirectly, the shadow angels hide in dark places because they hate the light, any kind of light since their eyes are completely black and very sensitive to light, they are usually incredibly aggressive towards demons but very protective of humans, the shadow angels have the ability to kill demons without the need for poisons or nichirin weapons and they are also incredibly protective of their young since even if they are shadows they reproduce by possessing and impregnating those they possess.