(Sword Art Online + Demon Slayer fanfiction)

As a transmigrator without any cheat codes, Tomioka Akemi was a little panicked when he found the breathing technique notes left by his ancestors. But when he thought that it was already 2022, how could there still be demons? He calmed down, until he heard about the SAO closed beta test...

"Hmm, this doesn't make sense. Why are Breathing Techniques and Sword Art Online in the same world?"

(Single female lead, Asuna, tentative storyline is Sword Art Online ---- Fairy Dance ---- Demon Slayer)

Rebellious Lord of All Realms: Su Chen's Dark Harem

Modern transmigrator Su Chen awakens a forbidden summoning totem and descends upon the Douluo Continent, accompanied by female titled Douluo characters from Naruto and Battle Through the Myriad Realms. He defies fate, crushes Tang San, and wins over female protagonists from the original world, including Xiao Wu and Zhu Zhuqing. With 15 top-tier powerhouses as his wings, he breaks the shackles of the Spirit Hall and the God Realm, forging his own dark harem and a new realm of myriad worlds in his journey to overthrow the old order.

(Multiple female leads, multiple female leads, I'll say it three times because it's important) Chen Xiaofan woke up to find himself transformed into an abandoned baby. After being adopted by an old man, he discovered that the village he lived in was called Holy Soul Village. At the east end of the village, there was a slovenly blacksmith who needed children to take care of him. Not only that, the blacksmith's child was named Tang San...

[Family-based cultivation + Many children, many blessings + Plundering across countless realms + Dimensional reduction attack]

Xie Wuwang, a powerful cultivator at the Tribulation Transcending stage, had his physical body shattered by lightning and fell into the Windless Belt.

Complete loss of cultivation? Depletion of spiritual energy?

Xie Wuwang looked at Empress Hancock before him and smiled calmly: "Since we cannot cultivate on our own, then let us create an immortal race and use the fortune of this world to recast our immortal bodies!"

As a result, the art style of the One Piece world collapsed.

While others practiced domineering techniques, he taught his son to practice the "Ancient Sacred Body".

While others ate the fruit, he taught his daughter to cultivate the "Ten Thousand Swords Return to the Source".

While others were robbing treasures, he opened the [Interdimensional Channel] to buy goods from the neighboring region!

Go to the Demon Slayer world: "Muzan? He's nothing but the dregs of an immortal medicine. Capture him and refine him into pills."

In the Naruto world: "Nine-Tails? This little dog is quite intelligent. Let's catch it and give it to the second brother as a mount."

In the Douluo Continent: "Tang San? Playing with hidden weapons? Before my natal flying sword, you dare to utter the word 'hidden weapons'? Kneel down!"

Years later, Im launched the Heavenly King's plan to destroy the world.

Xie Wuwang sat high above the heavens, annihilating the Red Earth Continent with a single finger, his voice indifferent:

"Insects know not the heights of the sky. Today, I will teach you what it means to be an immortal and what it means to be a god!"

During the Warring States period, numerous generals rose up, and the small province of Ashina was engulfed in war, leaving its people destitute.

The raging war only came to a halt when a woman known as the Sword Saint appeared.

[Crossover] [Sekiro] starts with a crossover, creating a brand new "Mortal Blade" to beat up Muzan from [Demon Slayer], giving rise to the Breathing of Death technique, ...and subsequently crossing over to worlds such as [Rakudai Chivalry], [Godslayer], [Touhou Gensokyo], [God Eater], [Holy Grail War], etc.

Many people have asked about the "single," "hundred," and "marry" options. Here's the answer: it's impossible to get married. The most likely outcome is "single," and the least likely outcome is "hundred." That's all.

He was reborn, but he had to step into the God Realm once again.

...

This time, Gu Bai has a plan for entering the Main God Space again: to become stronger and evolve—he needs a goal too!

The Black Virus forms the basis of evolution, combined with the Chimera's heart to strengthen the body, the Kaguya clan's bloodline limit to enhance the bones, and unparalleled fighting spirit as the cultivation technique...

Evolution has no limits, what will be the next accessory for Gu Bai?

...

Monster blood?! Devour! Rare and precious treasures?! Devour! Superpowered items?! Devour!

Devour everything that can make you stronger!

————

...Virus devours Group 1: 131109822

[Naruto + Hypocrisy + Dark Themes + Ruthless Methods + No Female Lead]

I transmigrated into the world of Naruto and became the Uchiha clan, obtaining the [Inheritance System].

As long as the deceased's approval is obtained, all of their abilities can be perfectly inherited.

And so, I became the gentlest sunshine and the kindest genius in Konoha.

I told Kakashi, "White Fang is a true hero."

I said to Obito, "The dream of protecting your comrades is incredibly noble."

I said to Itachi, "I feel your pain."

Everyone thought I was the light that illuminated the darkness.

They didn't know that I personally guided my parents to the battlefield and smiled as I bid farewell to each of my "closest friends."

I wept before the memorial and mourned at the funeral.

Until the night of the annihilation, I stood on Fire Shadow Rock, looking down at the burning territory of my clan, and opened my arms.

"Thank you for being the nourishment that helped me reach the summit."

When the spirits of all the past Shadows crown me, calling me the Savior...

I laughed.

"No, I'm just a professional estate harvester."

Gu Chen is reborn in the Douluo Continent, awakening his Martial Soul, the Power Lock, and possessing the innate ability "Born to Fight, Until Death"—the far north, a forbidden zone for humanity. Guided by the Power Lock, he arrives there and finds the soul of a million-year-old Mirror Shadow Beast sealed within the extreme ice. The million-year-old Mirror Shadow Beast, with its ancient mysteries, and its story with the God Realm and the Rift Space, gradually unfolds. Guided by the Power Lock, he signs a Super Beast Contract with the Mirror Shadow Beast's soul. From then on, he becomes a Mirror Shadow Super Beast Warrior. The story of this continent changes because of him! (This is a different Douluo story, quite different from the original.)

Because of the "Yuan" incident involving a food delivery, Zhang Youjing transmigrated to the Naruto world, awakening a god-level critical hit return system and embarking on a journey of revenge across various anime worlds! Knowing the anime's plot, Youjing knew that Obito, Madara, and Kaguya Otsutsuki would inevitably attack, and the situation was dire for the ninja world... But he wasn't afraid. With the system's support, he frantically increased his strength—just go for it! Hyuga Hanabi is so beautiful, even more so than her sister! Youjing unleashed his charm and power, and won her over! The Sage of Six Paths: This little guy is stronger than Naruto and Sasuke! Konan: Youjing is so strong, Nagato is no match for him! Sakura: Sasuke, you're so arrogant! I'm going to find Youjing, don't cry if you dare! Soon, the Ninja World War began, the two sides fighting so fiercely that the ninja world trembled, the sky darkened, and the ninja world fell into despair, until Youjing returned from his training! Youjing: "Six Paths Madara, Kaguya, Momoshiki, Isshiki... Is that all?" [Naruto... Genshin Impact... One Piece... Saint Seiya... Ultraman]