It Seems That I've Slipped Into a Different World. Also, My Gender Has Changed. - Chapter 109: Bustling, New Year’s Eve at the Residence

Mark is a genius military weapon designer who was kidnapped by a mafia gang after refusing to work for them.
They forced him to design unique weapons for five years, until one day he successfully escaped only to get shot by his trusted comrades.
*Ding! You awakened a weapon system.
When he opened his eyes, he was in a different body and in a different world.
"You want to kill a wild boar without being detected? Forget about bow and arrow. Here, I present you this sniper rifle."
"You want to kill a horde of goblins from the sky? Forget about those flying carpets and brooms. Here, I present you the fighter jet."
"You want to kill a dragon? Forget about taking the help of the S-class adventure team. Here, I present you a nuclear bomb."
Join Mark Spencer/ Lu Zhen as he brings the whole world to its knees with the help of his weapon system.
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Note: Author isn't born in an English-speaking nation and has no editor either. So, please be understanding if there are any grammatical errors.
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One Piece World (Completed): On the eve of the summit, the Navy Headquarters urgently needs a large number of elite combat forces to deal with the Whitebeard Pirates that will attack the Navy Headquarters next.

At this time, Warring States thought of the man who once shined for a while.

“The former admiral, the man with the most potential to become a marshal!”

“He was with Roger, Whitebeard, on this sea.”

“But he was also the only general who made a big mistake and was erased by the navy.”

Recalling the past, Warring States fell into hesitation.

Whether to use him or not, this will make the Navy take great risks.

The World of Naruto (Hot Serial): Starting from becoming the younger brother of Golden Shining, starting from the night of the Nine Tails, subverting Konoha and subverting the ninja world.

Sarutobi Hiruzen: No one would have thought that the young man who had been mediocre for twenty years would possess a terrifying strength no less than that of his elder brother.

No one would have thought that Konoha’s golden flashes were two men!

- Description from novelbuddy

[No weak protagonist, No simp, Prodigies battle for supremacy, Explosively satisfying invincible (Overpowered) protagonist type]Jun Xiaoyao transmigrates to a Xuanhuan (mysterious fantasy) world, becoming the Divine Scion of an Ancient Aristocratic Family. He possesses an unbeatable background, world-shocking talent, and furthermore, obtains a sign-in system. At the very start, he signs in and receives a fully developed (Great Accomplishment) Ancient Sacred Body.Signing in at the Taiyue Ancient Stele, he obtains a six-star reward: the Divine Elephant's Prison-Suppressing Strength!Signing in at his ten-year-old banquet, he obtains a seven-star reward: the Supreme Bone!Signing in at the Bronze Immortal Palace, he obtains an eight-star reward: the Myriad Creatures Mother Qi Cauldron!Signing in at the Boundless Realm Sea, he obtains a ten-star reward: the Great Art of Transforming into Freedom!Countless years later, Jun Xiaoyao sits cross-legged in the Ninth Heaven, points his sword towards the Azure Sky and declares: “Across the Nine Heavens and Ten Earths, I control destiny! At the end of the Immortal Path, I am the Apex!”Novel Keywords: Opening with a Sign-in to an Ancient Sacred Body

“Jiang Fan, I regret it!”When Xu Yining realized that the useless fiancé she would rather die than marry had taken her sister as his wife and transformed her into a powerful empress, she was filled with regret.If she could do it all over again, she definitely wouldn't have petulantly let her sister marry in her stead!