In the Marvel universe:

Captain America: "Tristan, can you stop smiling like that while you're crying like that?"

Iron Man: "Damn it, Diarmuid! Turn off the halo!!"

Ancient One: "Merlin, if you dare to crossdress again, I'll throw you into the Dark Dimension to keep Dormammu company!"

In the world of One Piece:

Garp: "Georgeus, come on! Let's go slay the dragon!"

Sengoku: "Tamamo-chan, give me a boost!"

Whitebeard: "Cú Chulainn, be my son!"

...

Adam Chronos, the ruler of the Throne of Heroes, leads the Heroic Spirits on a journey through countless worlds in search of the seventy-two Demon Pillars that will destroy their worlds.

For revenge, and also for the reconstruction of the world.

Forge bonds with important figures from various worlds,...

[Game + Another World + Dual Talents + Powerful Secondary Class + Leveling Up] He is selfish and cold, no longer trusting others. He is vindictive, adhering to the principle of revenge from morning till night. His talent connects to the endless abyss; he possesses unconventional dual divine talents, giving him the capital to rewrite his destiny. On the surface, he becomes a powerful secondary class figure, moving among various forces and amassing wealth. Secretly, he joins the Burning Legion, wielding demonic power and becoming the most terrifying demon warlock in Erelia, the underground emperor. To control demons, amass wealth, and resources, he forced himself into becoming a powerful secondary class figure. He achieved self-redemption, reaching level 100 and becoming a god, changing the fate of humanity. But in reality, he just wanted to live freely... His name is Anderson, a small figure who changed the world.

(System + Original Characters + Satisfying Story + Making Up for Regrets + Non-Darkening + No Mary Sue)

With the Otsutsuki clan invading again.

The conflict between Naruto's family and Kawaki erupts once again.

The ninja world was destroyed, and the memories of the entire world were altered, making Boruto the target of everyone's hatred.

While Naruto was sealed by Kawaki, he was rescued by Orochimaru.

To save the ninja world.

Naruto chooses to carry Orochimaru and Sasuke's memories and, with the help of the modified Noble Phantasm Ryou, returns to thirty years ago.

This time, he actually awakened the Naruto Assistance System!

As long as you have enough reputation points, you can exchange them for various items, bloodlines, and abilities!

Change the fates of Nagato, Konan, and Yahiko, and have them join Konoha Village. Reward: 3,000 reputation points.

Changing the fate of the Uchiha clan, the Uchiha clan successfully returned to Konoha, rewarded with 5,000 reputation points.

Create the Gotei 13 of Konoha, change the fate of the ninja world, and you will be rewarded with 10,000 reputation points.

Naruto becomes Hokage again and leads Konoha to unify the ninja world!

In this lifetime, no one can take the ninja world from me!

True peace is unity!

...

The Third Hokage: Compared to Naruto Uzumaki, I am completely incompetent as the Third Hokage.

Madara Uchiha: I have to admit, Naruto Uzumaki is qualified enough to dance with me!

Hashirama Senju: Naruto's Will of Fire is the true Intent of Fire for the new era.

[Apocalypse] [Space] [Natural Disaster] [Rebirth] [Superpowers]

A comet named Tianwei caused three years of torrential rains and continuous tsunamis worldwide.

As a result, Earth experienced its sixth mass extinction prematurely, known as the "Tianwei Era," in which 99% of humanity perished.

Lin Zhan, who died in the apocalypse, unexpectedly returned to a month before the arrival of the comet.

Having gained experience, he decided to find a way to survive the tsunami.

But unexpectedly, through a series of unforeseen events, he stole Noah's Ark, which was built for the world's richest man...

Li Xin's soul transmigrated to the world of cultivation, possessing the innate talent for longevity and gaining strength of 100 jin per day. Due to his disability in his previous life, he valued his body highly and thus enjoyed health preservation: "If anyone disturbs my health preservation in this life, I'll beat them to death."

[Decisive and ruthless + Prodigious talent + Superb readability + Satisfying chapters]

Throughout the entire universe, throughout history, there have been countless geniuses and prodigies, but I, Lu Yu, dare to call myself the number one!

An invincible myth?

A peerless genius throughout the ages?

A peerless young supreme being who will shake the ages?

It was merely a product of stealing a bit of my talent.

Possessing the mysterious Black Star, Lu Yu's comprehension is extraordinary. Ancient forbidden techniques, heaven-defying methods, and unparalleled imperial secrets that others need hundreds or thousands of years to comprehend, he can master in an instant...

...

[Not invincible, not a system, not mindless, not a wish-fulfillment story, not a harem, not a cliché, slow burn. Enter at your own risk if you mind these things!]

Fang Yun unexpectedly obtained a cylinder, which changed his precarious fate and brought him into contact with martial arts and immortality—things unattainable for ordinary people. However, his original dream of becoming a small landowner was also drawn into royal intrigue, and he encountered the desolate plains, monster valleys, and endless deserts…

Pure natural disaster + rebirth + hoarding + strong female lead and strong male lead + space

(Not a Mary Sue, there is a male lead, but he appears relatively late in the story)

In his previous life, when the apocalypse arrived, Jiang Jing had just finished his internship and was holed up in his dorm revising his thesis every day. The government issued a warning of heavy rainfall, and Jiang Jing stockpiled a lot of food in order to revise his thesis day and night. Jiang Jing could have just relaxed, but unexpectedly, after he had just lost his father, stepmother, and younger brother, the school heartthrob came to seek refuge with his best friend, and he kindly took them in.

Unexpectedly, they ended up handing her over to a local bully for such a small amount of food. Unable to bear the humiliation, Jiang Jing bit her tongue and committed suicide...

Given a second chance at life, she decides to tear apart the scumbag and the bitch before giving up.

But where did this handsome fiancé of mine come from? Wait, don't touch me... You'll support me? Who needs you to support them...

Jiang Jing was keeping a very low profile at the government base, so how did he still get targeted? Seriously? I just wanted to slack off...

As a transmigrator, Shirakawa Haruma naturally obtained a cheat system—a system formed from a wisp of divine power from an unknown deity. Just as he was preparing to drop out of school and embark on an extraordinary journey, he unexpectedly discovered that this was a crossover anime world!

Currently, the tentatively confirmed female leads are Kaguya-sama: Love Is War and Kasumigaoka.