Male-to-Female Transformation, Invincible, Cthulhu 男变女，无敌，克苏鲁

1 异 Abnormal Survival: Becoming a Mysterious Girl 异常存活：化身诡异少女 Warlock Group术士组Urban1.0M WordsOngoing Six years ago, an irresistible disaster swept across the globe, leaving fewer than one in ten billion people alive. In a new era roiled by undercurrents, Qin Ming, an “ordinary” young man of the age, is caught in a vortex destined to end badly. When the uncanny appears without warning in a fledgling city, and creatures from another world crawl through the cracks, eroding humanity's last hope like a flood, Qin Ming, transformed into a mysterious girl under the influence of some unknown entity, be 3.4kReads9.4Score347Shelves

Reader note

The first book will satisfy your requirements just by reading the introduction; for the second book, don't look at the name but look at the rating. Although the introduction does not indicate Cthulhu, its content is similar to Cthulhu; the third book is simply amazing, the ubiquitous Cthulhu style and the protagonist's step-by-step experience of becoming a god will definitely attract you deeply! (I can't guarantee invincibility)

5 从 From Street Thug to Commander of Three Armies 从地痞流氓，到三师总长 Red Attendant赤色侍者Urban329k WordsOngoing (The early part features modern-day martial arts, while the later part spans countless worlds. There are also some gacha-game and fanfiction elements, but they don't affect the overall reading experience.) "Lieutenant General, do you have faith?" "I do." "Then may I ask who you have faith in?" "Two people. One is my father, and the other is Lord Chihong." "Division Commander! You're in charge of the Third Division now. Could you please show some restraint for once?!" "Sis... You don't have t 2Reads—Score—Shelves

Reader note

It should change later! There should be some Cthulhu elements. If it is invincible, it should not be counted. The protagonist will only have T-two combat power later on.

6 最 Why Are Magical Girls These Days All Like This? 最近的魔法少女怎么都这个样子 Fei Er Le Si菲尔勒斯Urban1.5M WordsOngoing [Gender Swap + No Marriage + Mild Yuri + Secret Identity + Not a Power Fantasy + Some Dark and Heavy Themes] (This story contains gore, some violence, and a tiny bit of horror. Please read with caution if you’re sensitive to such content.) Elegant, gorgeous, cute, and powerful, kind. That is the true face of so-called “magical girls.” They awaken for the sake of “love and protection,” fight the demons from beyond, and safeguard the precious everyday lives of ordinary people. “I am the Black 9.1kReads9.0Score987Shelves

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Isn't this the one?

7 末 Apocalypse Transformation: Becoming the Ruler 末世变身：然后成为支配者 The Queen's Pony女王的小马Sci-Fi & Apocalypse483k WordsCompleted [Transformation + Apocalypse + Scumbag Protagonist + Cthulhu] Cthulhu-style synopsis: The fish-people of the deep sea circle an ancient structure from a distant age, singing an indecipherable, seductive song. Beneath the only pure-humanity base, a horrifying, indescribable behemoth sleeps seventeen thousand meters below the abyss. The crimson sky rains scarlet blood. In an instant, evolution leaps across millions of years: the blood of the Outer Gods, a gift from the ancestors. “I see... I see. 242Reads8.4Score—Shelves

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In the last days of restraint, it becomes a hundred stickers|･ω･`)

8 变 After Turning into a Tentacle Girl, I Never Want to Become Her Servant 变身触手娘后绝不想成为她的眷属 Anytime, Anywhere随时随地Urban215k WordsOngoing My latest work is here! You’re welcome to read it on Tomato Novel. I hope you’ll enjoy it. Your support motivates me to write, and I’ll do my best to tell every story well! 708Reads8.2Score101Shelves

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Good looking, everything except invincible

9 原 Genshin Impact: I Became a Follower of the Tsaritsa 原神：成为冰之女皇的眷属 Huan Tong患瞳Anime Fanfiction1.2M WordsCompleted After repeatedly dying on pity pulls, Tavinall opens her eyes to find that she has successfully joined the Fatui and been appointed by the Tsaritsa as an inspector tasked with touring the seven nations. Although she belongs to the Fatui, she stands outside the system of the eleven Harbingers. As the only inspector, she answers solely to the Tsaritsa. To carry out the will of the Tsaritsa, she is sent out to assist with and monitor the progress of obtaining the Gnoses. But with a villain's script 11.1kReads9.5Score1.1kShelves

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The micro-gram series, slowly getting stronger, was a masterpiece in Genshin Impact many years ago. As an old reader of hers, I must promote it!

10 血 Flesh and Machine, Fused and Interwoven 血肉机械，融合交错 Mo Ran, Who Loves Sesame Seed Pastries爱吃瓜子仁酥的墨染Sci-Fi & Apocalypse493k WordsCompleted [Apocalyptic survival + base building + monster armies + invincible power] Flesh for a body... machinery for bones... The two merge... a forbidden creation... It is awakening... It has gathered the love of ???... It is beginning to awaken... Crown it! Crown it! Crown it! Crown it! Crown it! Crown it! Crown it! A sudden trial transported every human on Blue Star to a world filled with monsters and disasters. Survive, grow stronger, and strive to make it to the end... These 132Reads6.5Score—Shelves

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It's almost Cthulhu-style, and the gender transfer requires the next few pictures. If you're invincible, it counts.

11 诡 Eerie: I Turned into a Little Girl, but I’m Really Not an Evil God 诡异：变身萝莉，我真不是邪神 Xiao Bei骁北Mystery353k WordsOngoing Xiao Nan was once the owner of a grocery store on Blue Star. Then a strange package turned him into an adorable white-haired little girl, and he decided to change his name to Xiao Nan and carry on with life. “Sure, this whole thing is a pain in the ass, but life goes on... Damn it! The more I think about it, the angrier I get. Forget it! Back to running my little shop!” But for some reason, ever since he transformed, all sorts of oddly dressed customers have started showing up at his little stor 312Reads7.3Score—Shelves

Reader note

Cthulhu loli evil god

12 果 Fruit Attack: Seems Like They're Taking Part in a Dungeon 果宝特攻似乎正参加副本的样子 Bitter Coptis苦黄连Anime Fanfiction2.7M WordsCompleted [An extremely long disclaimer section] [Because of the protagonist’s actions and personality, this book may not suit readers who are overly hostile, prefer lone-wolf protagonists, dislike official organizations, or are absolute self-interest types, among other similar readers.] [This book is, to put it simply, pretty childish.] [Its main selling point is a complicated mix of elements, but with a normal set of values.] [It contains a huge amount of gender-swapping and transformation, but there de 6.9kReads9.0Score541Shelves

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The mid-term transformation is almost like Abigail's Silver Key

13 背 After Betraying My Teammates, I Turned into an Abyssal Girl 背刺队友后，我竟变成深渊少女 Industrially Manufactured Moon工业制月亮Eastern Fantasy774k WordsOngoing The rating just came out, don’t be scared QwQ. The beginning is pretty rough, but it gets better later. [One heroine + pure romance + two souls in one body + lots and lots of everyday life + a little fighting + sweet romance] Also, this is not yuri! Good news: Ye Chen is back from the dead! Bad news: His gender has changed, his species has changed, and he’s sharing one body with an Abyssal girl! Even worse news: The body’s original owner, Miss Lier Daisi, keeps complaining from inside their ment 1kReads7.1Score117Shelves

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Look at my [eating melon]

14 西 Western Fantasy: I'm a Ghost! Not Your Sister! 西幻：我是幽灵！不是你姐姐啊！ Ci Bu Chi Tang次不吃糖Eastern Fantasy324k WordsCompleted [Western Fantasy] + [Transformation] + [Two Heroines] + [Protagonist with a golden finger] + [Cthulhu] + [Industrial World] Just after transmigrating to this otherworld, where the Industrial Revolution has only just begun, our protagonist looks at their transparent body, then at the women's trench coat they're wearing. Well, case closed. I've become a female ghost! At that moment, Alia stares at her blankly and blurts out, "Gwah! It's an evil spirit!" The protagonist's face darkens. What do you 2kReads8.7Score282Shelves

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Poor poor child, please use some traffic [cry][cry][cry][cry]

15 尸 The Little Junior Sister of Corpse King Long You: I Have Quite a Few Trump Cards 尸王龙右小师妹：我的底牌有点多 Chasing Dreams Under the Full Moon圆月追梦Anime Fanfiction163k WordsOngoing A gender-bender story, yuri, and a stunningly beautiful mature woman. She is none other than Corpse King Long You's junior sister! Yet, against her will, she is caught between the forces under the Corpse King, the shadows of Black Fireline, the secret guardians of Yanhuang, and the schemes of the European Union's Dark Council. Four great powers, tangled together, with danger lurking everywhere. She may seem delicate, but she harbors a world-shaking secret. At the heart of this dark maelstrom, wi 54Reads—Score—Shelves

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Transformed into a beautiful royal sister in the apocalypse

17 生 I Failed to Quit Lust Before I Died, and I'm Still Trying After Death 生前戒色失败，死后仍在戒色 Drunk After Ten Thousand Miles万里一醉Mystery484k WordsOngoing [Bizarre Game + Wearing Human Skins and Becoming Bizarre (Single Heroine) + Dungeon Escape] Every bit of power you gain is a pledge of your soul to the abyss Late at night, a blood-red vortex icon appears as an app on your phone, installed without your permission. A deadly game called “Bizarre Theater” quietly begins to encroach on reality. Here, bloodstained supernatural objects can ward off evil, but they gnaw at your flesh; coexisting with a ghost can turn a hopeless situation around, but lea 596Reads5.5Score—Shelves

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This one is okay, but the new book

18 不 Not the Protagonist? Then I’ll Just Have to Become the Ultimate Lifeform 不是主角？那咱只能当究极生物了 Lin and Lin临与琳Urban1.8M WordsCompleted (No System, no ring, no old man, not an orphan, no younger sister! Not reborn! Single, a story about a villain’s growth (this part is rather slow)) This is a planet that has yet to be fully explored. Monstrous beasts, secret realms, prophecies from the ancients? Legends? The truth hidden beneath a peaceful life? Can we uncover the secrets hidden in this world? I’ve read a lot of novels, and come across plenty of toxic plot points, or things that simply annoyed me. Why does the protagonist lose 5.9kReads8.9Score679Shelves

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I always thought it looked pretty good, although...

19 转 Reborn as a Little Girl, I Bear Countless Offspring 转生萝莉，我孕育万千子嗣 Yan Zhuangxing阎庄行Eastern Fantasy558k WordsCompleted [Transformation + Army-Building + Mastermind] [Parthenogenesis!!] I reincarnate as a defenseless, white-stockinged little girl in a world where everyone wants a piece of me. So Xin Yu has no choice but to reveal her other identity. “An Old One who has walked through the ages...” “The great creator of primordial life...” “The god of flesh who gives birth to countless offspring...” As an Old One who gives birth to countless offspring, what’s the harm in raising a few million troops? Wait, why is m 3.4kReads9.1Score444Shelves

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That's okay, black goat

25 凌 Beneath the Skies 凌霄之下 It's Silly Yu, Not Shark是傻雨不是鲨鱼Sci-Fi & Apocalypse336k WordsOngoing [Transforms into a mecha girl + decisive and ruthless + strongest non-combat class user + Divine Key] In the interstellar age, humans with non-combat classes emerged to fight off the invasion of Void Beasts. At the cost of the life of the strongest non-combat class user, callsign “Lingxiao,” the ruler-class Void Beast “Abyss” was defeated. But... After the final battle, only a mysterious silver-haired girl remained on the battlefield... The vast universe is full of mysteries and the unknown, wai 160Reads6.8Score—Shelves

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Transformed into one of the thousands of descendants of Yog-Sothoth's split

46 瑟 Seranvia's Dungeon Adventure 瑟兰薇娅的地牢之旅 The Seventh Epic第七史诗Anime Fanfiction125k WordsCompleted (The setting borrows from Darkest Dungeon, but you can follow along even if you've never played it.) “Our family has fallen into decline...” A letter, a small town, and a mage. Seranvia sets out to find her master and uncover the truth about the town, without a hint of fear. Even if the road ahead is full of thorns, even if all hope seems lost, even if every teammate is crushingly overpowered (not really)... I, Seranvia, will never give up! 2Reads—Score—Shelves

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Darkest Dungeon, Cthulhu

49 命 On the Brink of the Abyss 命悬于渊 Perched by Bamboo, Listening to the Wind栖竹听风Mystery146k WordsOngoing Eastern Horror x Cthulhu Mythos x Shattered Mythology x Ensemble Cast and Fate Born with Yin-Yang Eyes, he witnessed the world turned upside down. His left eye held the sun, yet he fell into a frozen abyss; his right eye glimpsed the Yin, revealing every kind of demon in the world. At the end of Liuli Lane in New Chang'an, he wore a thousand faces. He was the appraiser at Shufang Studio, golden hair falling to his shoulders, able to hear a thousand years of echoes with the touch of his fingertip —Reads—Score—Shelves

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Everything except invincibility, slow pace, transformation in Chapter 45