Why are mousefur x longtail fanfics popular?

This is a strange world where everyone can build Dream Dungeons. Qiu Ren also becomes one of the many Dream Makers. So, welcome to the dream I built. You can experience the thrill of being the winner in “Battle Royale;” Seek salvation in “Dark Souls;” Slaughter the gods wantonly in “God of War.” Lastly... some dreams are very harmful to your body. Please don’t be too addicted to them.

[WPC #224 Silver Price Winner: Undead and inmortal] Hello little soul. Were you murdered? Hit by a truck? Did you commit suicide or just slip in the bathtub? Well, the point is, you're dead. But don't worry about that, because this is not the end. Welcome to A.T.I.R. At A.T.I.R. we make sure that qualified souls who deserve a second chance are sent to other worlds to live a new life! Although it should be noted that not everything is free. It is likely that after your reincarnation, you will have to fulfill a certain purpose. But nothing too serious, so don't worry! Now enjoy your new life! WARNING: The journey between dimensions can cause the acquisition of superpowers, loss of senses (blindness, deafness, loss of touch, etc...), baldness, short-term memory loss, loss of organs, and body malformations. The agency is not responsible for the place or world where you will be reincarnated, if your species changes or if you suffer a problem during the trip. Any inconvenience you may have, please notify the complaints department (they will probably ignore it). Thank you for choosing A.T.I.R., have a happy life! "That doesn't sound very good..." Follows the story of Marcus, a simple guy who was reborn in a skeleton and despite all the misfortunes, somehow he is still "alive". Fighting monsters, demons, humans, ridiculous situations, and existential crises. Marcus will embark on an adventure to get his freedom in this new life and find the reason why he was called to this world. But his decisions could alter the destiny of an entire universe. Starting from the bottom to reach the heavens. **** Sigh... Look this is my first novel so I honestly don't know how to write a good synopsis without making too many spoilers But trust me, the novel is much better than this synopsis. I would appreciate any kind of critique to help me improve as a writer and English is not my native language. So I apologize for any grammatical errors, I will try to fix them if you let me know. I will try to post a minimum of three chapters per week.The chapters are between 2000 to 3500 words. (The cover was made using A.I)

    Love is a very beautiful feeling, then why it turns out an ugly scar for her.           Sia never understand what she has done wrong, she for her entire life love Arnav, she never cheated on him or do anything wrong, she even not hurt anyone. Then why she ended up losing everything. Her love of life, her child, her father, everything.  But then again she gets a chance to re-do her life. but why? In her previous life, she takes revenge on those who hurt her but in this process, she lost what is valuable for her, she does many mistakes, then why God gives her a new chance, she by no means a good person. But now if she gets the chance to change things for good, then she will surely protect those who love her and ignore the other. She avoids the mistakes she has done in her previous life. This is the story of Sia & how she changed her previous life tragedy, and gain life.

After Frisk finally managed to bring peace to her universe a certain glitchy skeleton appeared out of nowhere and erased it from existence, but luckily the goddesses Fate and Destiny found her Soul and decided to let her reincarnate, what will Frisk do? And will she be able to stay a pacifist... (I am not a native english speaker, so please forgive me for any spelling mistakes, this is also the first novel I am writing, so don't expect high quality stuff, this is just going to be some half-assed story, that I am writing because of quarantine, and I repeat DON'T EXPECT QUALITY! Btw obvious DISCLAIMIER, I don't own BNHA or Undertale and the cover art was made by Patzzi and reedited by Solunary.)

Jane Walker was in the middle of a streak of bad luck. His cat scratched him, his second attempt to awakening failed, and even his girlfriend dumped him. And when he thought his luck could not turn worse, the bus he was in was swallowed by a spatial singularity, a [Dungeon]. But in the middle of struggling for his life, and when Jane thought it was his end, something unexpected happened. Together with the appearance of a self-proclaimed Immortal, his body received strength, mana, and skills. But soon, Jane noticed something strange. His skills… were a bit different than normal. ... This novel contains R-Rated content. You have been warned...

It was supposed to be simple cosplay show. He didn't think much of it and only participated due to a friend's invitation. So why the hell did he find himself in this World? In a World where Demonic Beast, Monster and crazy fanatical cult are lurking around. SIOC! Slight AU!