Sword Art Online - Vol 1 Chapter 15

The worst thing that Shui Ruoshan think he ever did? He wrote the story of “The Strongest King in History”.

What happens when a fanfic author with a habit of lying and scheming suddenly finds himself as a self insert during Duelist Kingdom? What happens when you have Yugi, Joey, Kaiba, and the rest encounter someone who knows all about every major player in their saga... and sees no problem with abusing said knowledge? Chaos, dear reader. Sweet, sweet chaos

Traveling through the world of One Piece, Ron, who became Kuina’s fiancé, awakened the god-level theft system.

In order to become stronger and change the fate of Kuina’s death, and to survive in this dangerous era of great pirates, Ron started to steal Sauron’s top kendo talent.

And that’s just the beginning.

In order to become stronger, Ron embarked on a journey to steal the talents of the world’s strongest.

“Ding! Congratulations to the host for stealing Karp’s physical talent!”

“Ding! Congratulations to the host for stealing Nika’s talent!”

“Ding! Congratulations to the host for stealing Shanks’ domineering talent!”

“Ding! Congratulations to the host…”

- Description from novelbuddy

Jiang Xunyi had transmigrated into a book many years ago, and always tirelessly maintained the requisite accomplishments for a villain.

After finally completing the ultra-difficult task to allow the male protagonist to kill him, an OOC warning had appeared out of the blue——

Error in the actor’s lines, the character role has collapsed, the assigned task has not yet been completed, opening the Rebirth System!

So, he gloriously became… a second idiot son about to be sent to his death.

Lazily idling away the days after changing his identity, he noticed a world-changing difference.

His best friend, the male protagonist, Yun Xie was actually secretly in love with him? Are you kidding me?!

- Description from Novelupdates