One Piece: King of the World - Chapter 9 - : The Luxury of Celestial Dragons!

Logan Mercer, an orphan barely surviving on his own, awakened the Spending System as a child.But as a broke teenager struggling to even pay his rent, how could he possibly use it?Bullied by his classmates and cast aside by society, Logan’s life changed the day he was suddenly surrounded by men in black suits.“Your father has been missing for over a year. As per his will, you are to inherit all his assets,” they said.To his shock, Logan learns that he was the sole heir of the Mercer family fortune — and with it came control of major businesses, unimaginable wealth... and the constant threat of his father’s competitors.“System, redeem one billion dollars,” Logan said.[Redeeming One Billion USD...][Congratulations! Your E-rank fire affinity has evolved into SSS-rank Phoenix Flame Affinity!]Now blessed with talent and wealth, all that's left is training relentlessly, growing his core, and unlocking even more different affinities within it.Follow along as Logan uses wealth and determination to rewrite his fate and grow stronger than anyone ever imagined.

Jiang Pengji got something called the Court Intrigue Stream System.
System: “Your goal is to become the most prestigious woman in the kingdom (the Queen)!”
Jiang Pengji: “Okay, System. No problem!”
Years later, she met the target by becoming the most prestigious woman (the Empress).
Jiang Pengji: “Well done, no?”

- Description from Novelupdates

What kind of experience is it to travel through time and become an AI?

Li Wenyuan, who was hit by the meteorite, successfully experienced this feeling.

Fortunately, he discovered that the planet he controlled… seems to be a little bit special.

“Precious living metal? Any wall here is living metal!”

“Zello? You said that omnics don’t need this? Sorry, psionic machines are being produced.”

“Interstellar colony? Isn’t it good to build a ring world?”

This is a story of farming, and it is also a story of human exploration of the universe from the past.

There are space wars, interstellar adventures, civilization observations, and galaxy epics.

“So…” A few years later, facing the disaster that was about to sweep across the entire galaxy, the unmanned fleet controlled by Li Wenyuan stood up helplessly.

“They all think that I am a lost empire, and I can only do what the lost empire should do.”

PS: space opera

- Description from novelbuddy

Another entry in what you can call the Proto Harem Series: the books written before the Harem Series that take place in the same world.

It’s about a swordswoman whose student is captured, so she goes to rescue her.