Does Rin From Blue Exorcist Appear In Anime Filler Arcs?

Elina thought she had hit rock bottom. She lost her job. Her therapy session dredged up memories of the ex-boyfriend who stalked and traumatized her. The only thing she had left to look forward to was the finale of her favorite fantasy series, Moonbound Faith. Then the show ended. The heroes won. The villain died. Everyone got their happily-ever-after. That same night, a knock at her door shatters what little peace she has left. Her ex is standing outside. The man who was supposed to be in prison. Forced to flee into a storm, Elina runs until she reaches the edge of a cliff with nowhere left to go. Faced with a choice between death and returning to the man who destroyed her life, she jumps. But instead of dying, she wakes up inside Moonbound Faith. Not as the heroine. Not as a side character. But as Luna—the infamous villainess whose tragic death she celebrated only hours before. Determined to survive, Elina plans to use her knowledge of the story to change her fate. But everything she thought she knew begins to unravel when a small boy tugs on her sleeve and calls her one word: “Mom.” The original story never mentioned a child. And when Elina uncovers the truth behind his existence, she realizes something terrifying. The villainess was never the villain. The story lied. And the ending she remembers may not be the ending waiting for her at all.

Most mystical creatures got to live pretty normal lives, but not all of them were that fortunate. Riyin's tale began when tragedy struck his home and he lost his parents in the hands of a mighty witch in a single moment. After managing to escape through a portal, Riyin was raised by the most powerful wizard known. Frya is a rare werewolf, legendarily named the Wild Beast and she learned of her real nature years after she lost all her family, save one brother, in the Great Battle, inspired by the Sisterhood. Now tinted with the mark of revenge, Riyin, alongside his best friend, Frya, embark on the quest to find the Sisterhood, a coven of the most powerful witches, the Violet Witch included, and avenging his family's death. Through fights, hunger, and many brushes with death, they finally find the Sisterhood, but they are not ready for what they meet.

A 25 years old boy named John is suddenly shot by his friend, which results in his death, but is reincarnated again as the new Demon King. Unfortunately, he agains dies in a battle. This time also he is reincarnated but as a human. Follow Vis' adventure as he gets revenge, becomes a demon and makes his own harem.

A Luna was reincarnated in two separate bodies, and her fate was divided as a result of the curse that she carries from the past. One of the bodies will usher in an era of tranquility for the human race, while the second will usher in an era of calamity for her kind! However, to make the soul whole again, One of the two bodies needs to give up her life to save the other; otherwise, both of them would perish. So, who would die for who, and why?

Kalina Adnan was thrown into another world when she wore a necklace given to her by her future mother-in-law. In a Nigella kingdom where demons and humans coexist alongside fortune tellers and witches. Surrounded by handsome demons and a myriad of royal political problems. Help reveal the evil of the black magic clan. Take on the role of a great power targeted by many. The chosen demon bride, the perfect vessel for Aurora's jewels. Will Kalina be able to return to the future or choose to stay in the Nigella Kingdom?

Serra is a normal senior high school student who works really hard every night and weekend to pay off her parents' debts from loan sharks. But when she couldn't keep up with payments anymore, she decided to end her life. Surprisingly, she woke up in a different light-- in another world. What's more shocking was when she is addressed by one of the people as the demon king's bride.