My Living Shadow System Devours To Make Me Stronger - Chapter 1 - : The Academy’s Weakest

A scientific genius named Thomas Harrier was transmigrated to an imperial prince body after a car accident that took his life. He found out that he is in a world similar to our own with a timeline akin to early twentieth century. The body that he is occupying was the imperial prince of a failing empire who suddenly rose to power after a successful assassination attempt of his father. Unaware that the attack is just the beginning of what is to come. He faces many challenges throughout. Will Thomas Harrier be able to live his second life in peace while running an empire and getting it back to its former glory? Or will he succumb into a conspiracy lurking within the country's borders?

Expect some:

Cold war era techs.

Super battleship with advanced electronics, propulsion, and fire control systems?
Helicopters?
Missiles?
Modern medicines and equipment?
AC-130?
A nuke?
Challenger or Abrams or Leopard?
F-4 Phantom or MIG-21?
Colored TV's.

Everything!!!

PS. Cover not mine, I just found it on google.

10 years ago, after “the Gate” that connected the real world with the monster world opened, some of the ordinary, everyday people received the power to hunt monsters within the Gate. They are known as “Hunters”. However, not all Hunters are powerful. My name is Sung Jin-Woo, an E-rank Hunter. I’m someone who has to risk his life in the lowliest of dungeons, the “World’s Weakest”. Having no skills whatsoever to display, I barely earned the required money by fighting in low-leveled dungeons… at least until I found a hidden dungeon with the hardest difficulty within the D-rank dungeons! In the end, as I was accepting death, I suddenly received a strange power, a quest log that only I could see, a secret to leveling up that only I know about! If I trained in accordance with my quests and hunted monsters, my level would rise. Changing from the weakest Hunter to the strongest S-rank Hunter!

Arthur Blackwynd didn’t expect to survive the strange and terrifying event that happened at sea. Even less did he expect to wake up in the DC Universe a world he’d only ever read about in comics.Armed with the Shadow Monarch System,the ability that grants him control over shadows and an undead army, Arthur is both awed by his new reality. As a lifelong comic geek, he knows the heroes and villains like the back of his hand Haunted by questions of why he’s here, Arthur struggles to find his purpose. Will he embrace the darker side of his newfound powers and become a villain, or will his sense of justice lead him down a different, unpredictable path?“why the likes of Raven seems to be watching my every move?” In a world full of gods, monsters, and legends, Arthur must decide who he will become and what role he’ll play in shaping the fate of the DC Universe.

“Reincarnated as an extra destined to die? Hell no! I’ll rewrite this story myself!”Charles was just a college student addicted to video games, pulling all-nighters and barely passing his exams… until he woke up as Rian Cole, the most despised member of a powerful clan. A background character. A loser. But above all…A dead man walking with an expiration date.In the original story, Rian Cole was born with uncontrollable lightning powers. He was shunned, abused, and ultimately thrown away as cannon fodder to buy time for the clan leader fighting against the hero.But Charles has no intention of playing that role.Armed with his gaming knowledge and an unbreakable stubbornness, Charles will forge his own path—even if it means defying fate, breaking this world’s rules, and shocking everyone who ever looked down on him.No system. No cheats. And Rian’s body doesn’t always do what he wants.And worst of all… the girls in this world are insane!