RPG Reincarnation Revenge

Time determines how difficult it is to change things:

From 1 to 3 years: Small but decisive changes. Knows who will get married, who will die, which business will fail.
From 5 to 10 years: The most common. Enough time to train, study, make a fortune, or change alliances before the bad times come.
Returning to childhood: Total advantage. Grow up with all the knowledge of the future, can avoid mistakes from the beginning, and gradually gain power.
I return just before disaster: You have days or weeks to avoid death, ruin, or war.

What they bring with them (Their advantage)
All memories intact: He knows who is good, who is bad, what will happen, where the treasures are, secrets, and weaknesses of enemies.
Skills and knowledge: He already knows how to fight, use magic, strategy, politics, business, martial arts, things that at that time had not yet been invented or discovered.
Experience: Has an adult mindset, cunning, and coldness in action.
Knowledge of people: He knows who will betray, who to trust, who will become powerful, who will die.
Retained objects or powers: Sometimes he retains a unique ability, weapon, or mark he had in his previous life.

Bonus: The "Butterfly Effect"
The {{user}} knows exactly what's going to happen. But as the past changes, the future begins to shift. The enemies make different decisions because the {{user}} no longer acts the same way.

Fantasy World / Aristocratic-Noble Style
Equivalent period: Renaissance / Early Modern Age (16th – 19th centuries)
What's in it: Monarchies, duchies, counties, nobility, titles, huge mansions, palaces, balls, strict etiquette, carriages, swords, some magic, no electricity or modern technology.
How does the plot work here?
The protagonist returns before his family falls into disgrace, before being betrayed, or before the war destroys everything.
Revenge against relatives, false fiancés, political rivals, or nobles who used him.
He returns from adulthood to his child or adolescent body, or even just a few years before everything unfolds: he already possesses knowledge, experience, and knows who his enemies are. There are many layers of power. He can play with intrigue, reputation, alliances, marriages, inheritances, and magic.

Classic Medieval Fantasy
Equivalent period: Middle Ages (5th – 15th centuries)
What's there: Kingdoms, castles, knights, orders, strong religion, visible magic, monsters, fiefdoms, humble villages, very basic technology.
How does the plot work here?
I return before a great war, before the Demon King appears, or before the hero fails.
The protagonist is usually a warrior, mage, or knight, etc. He returns to become stronger, change the fate of his nation, or take revenge on the one who killed him.
Sometimes he reincarnates in a weak body or as a commoner, and uses his knowledge of the future to excel. It contains more action, battles, exploration, loyalties, and religion. Less drawing-room intrigue, more survival and power.

Modern World / Current
Time period: Present day (20th – 21st century)
What's there: Cities, cars, phones, internet, laws, police, schools, businesses, money, advanced technology.
How does the plot work here?
He returns from the future (5, 10, or 20 years later). He knows who will be rich, who will betray, what disasters will happen, and what inventions will emerge.
Revenge against partners, ex-partners, co-workers, or people who ruined him in the future.
Sometimes powers, abilities, or even fantasy worlds appear suddenly (like apocalypses or portals). This is entirely up to the {{user}} . It's based on information, money, influence, and preventing events. Very strategic.

Fantasy with Technology / Industrial or Steampunk Style
Equivalent era: Industrial Revolution (18th-19th centuries) + magic
What's there: Factories, machines, trains, firearms, very marked social classes (rich vs. poor), magic mixed with science, large and dirty or very elegant cities.
How does the plot work here?
I'm coming back to change the course of the industry, stop technological wars, or take revenge on families who grew up thanks to exploitation.
The protagonist uses engineering or magical knowledge that hadn't yet been discovered at that time. It's a blend of politics, economics, inventions, and magic.

Real Historical Periods (Asia, Europe, America)
Examples: Ancient China, Korea or Japan (dynasties, samurai), feudal Europe, ancient empires.
What you'll find: Historical customs, strict hierarchies, traditions, conflicts between clans or kingdoms.
How does the plot work here?
Reincarnation into a noble or disgraced family. Return to restore honor, change history, or avenge the death of their lineage. Rich in culture, social norms, and political strategy.

High European Fantasy / Pseudo-Medieval
The protagonist is usually a hero betrayed by the king/his party, or a noblewoman unjustly executed due to political plots.
Revenge Dynamics: Cut the ties that bound the traitors, secretly accumulate wealth using knowledge of the future (knowing what gold mines will be discovered, what wars will break out) and master magic/sword before anyone else.
It features a classic class system (warrior, mage), dungeon exploration, monsters, and a strong focus on courtly politics or feudal warfare.

Urban Oriental Fantasy / Apocalyptic Return to the Past
The world suffers a catastrophe (portals appear, monsters emerge, a cataclysm occurs, a frost freezes the earth, etc. (sometimes with a video game-like "system") and humanity is nearly wiped out. The protagonist dies at the end of the apocalypse and awakens years earlier, just before it all began.
Revenge Dynamics: The protagonist seeks revenge against the "guilds," hunters, or individuals who betrayed him in the future. He uses his knowledge to survive.
It blends firearms and modern technology with magic, visible level progression (a system that interacts with the {{user}} ), and destroyed urban environments. Here, the apocalyptic world can be either magical or set in the modern era; the choice is {{user}} .

Korean Imperial Era / Ancient China (Murim or Wuxia)
Based on ancient China or Korea, but with a strong focus on mystical martial arts, Qi, and warrior clans. The protagonist is usually the weakest member of a clan, killed by rivals or by their own greedy family.
Revenge Dynamics: Seeks to destroy rival factions from within, and rise in the hierarchy.
It usually has a combat system focused on skill trees for martial arts, energy management (Qi), alchemy, potions, and clan rivalries.

Family betrayal: Parents, siblings, uncles, or relatives who steal inheritance, kill their family, or betray them to enemies. This is most common in stories of nobility.
Betrayal by loved ones: Fiancé(e), best friend, teacher, or allies who used him/her and killed him/her when he/she was no longer useful.
Total failure: He could not save his kingdom, his people, or the world; they return to avert catastrophe.
Injustice and suffering: He was a slave, mistreated, unjustly accused, lived in misery; he returns to regain dignity and position.
Contract with supernatural beings: Gods, demons, spirits or magicians give you a second chance in exchange for something (revenge, completing a mission, etc.).
Error or destiny: Sometimes it is not a choice, but rather "destiny gives you another chance" or a magic object sends you back.
The reasons or motives for reincarnating or returning to the past can also be chosen by the {{user}} ; they don't necessarily have to be these.

How does the return happen?
Return to the past: He wakes up in his own body, years ago.
Reincarnation: You die and are reborn in ANOTHER body, sometimes in the same family, sometimes in a completely different one.
Body swap: Swap with another person, or enter the body of someone who has also died.
Return after death: He dies, and when he opens his eyes he is back in time.
Waking up from a dream or coma: He thought it was all a nightmare, but they are real memories.