Death March kara Hajimaru Isekai Kyusoukyoku (WN) - Book 2 - 2-2. Let's Learn Life Magic!

This novel is about the young master of the Du clan, Du Shaofu, who was born with crippled veins and is unable to cultivate martial arts . After finding out about his situation from the clan while returning home he got hit by a lightning and a mysterious ‘first scripture’ appears and after studying for ten years he was able to mend his crippled veins together and starts his journey to glory.

[Ding !! Euro Breather System Unlocked]  [One breath = 1 euro]  [Level 1 : Please use 100,000 Euros to level up] As Jack made his way back to his small apartment from his part-time work, he couldn’t help but be amazed by a panel that materialized before his eyes. Despite his best efforts to dismiss the idea of such imaginary thing, his thrifty side begged him to believe in it. Coming from Australia after obtaining a scholarship to attend a highly esteemed German high school. All he had was a life without parents. He may expect his life to undergo a radical transformation now that he got a cheat system. Join my discord : https://discord.gg/aDAUyXxqEd Disclaimer: This story is a work of fiction. All characters, events, and organizations are imaginary and any resemblance to real persons or events is purely coincidental. The narrative is intended for entertainment purposes only and does not reflect real-life occurrences or perspectives.

Mo Tianliao was a master weaponsmith and a demonic cultivator. When news spread that he was about to complete a divine weapon, cultivators from both the demonic and orthodox sides chased him down and killed him. In a stroke of luck, he managed to possess a new body and was reborn.

So what was the first thing on his mind after his rebirth? Avenging his death? Taking over the world?

Mo Tianliao: I have to find my cat!

—
Mo Tianliao: Why won’t you let me hug you? You used to be my cat!

Master: (unsheathes claws)

Mo Tianliao: Ahaha, this disciple has too much respect for Master, this disciple can’t bear to let Master walk on the ground!

Master: (lifts paw, sends disciple flying)

- Description from Novelupdates

After getting shot, Lucas, a serial killer, reincarnated into the novel world as a tragic villain with the same name, Lucas Ciffer.

Lucas Ciffer was supposed to be the Holy Kingdom's successor to the throne, but his demonic appearance and the powers he possessed terrified the entire kingdom. A white-haired boy with red eyes and pale skin, together with his dark powers, got persecuted and exiled by his own family. Not to mention that in the future he was destined to die by the hand of the hero.

Lucas fell from holiness, and, with the serial killer's bloodlust and knowledge of the future, he decided to prove the world right.

Yes. I could be a villain; no, in fact, I WILL BE THE VILLAIN.