Manga/Manhua Where the main character is a Immortal /Un-killable.

1. To You, The Immortal.

Dropped from the hand of a mysterious being, a lone orb begins a journey of discovery. With the power to imitate both living and non-living things, it can take the form of objects, animals, and people it meets along the way. Gaining consciousness, emotions, and eventually the name Fushi, the immortal creature learns both the beauty and suffering the world has to offer. But humanity is in great peril from powerful beings called the Nokkers, who Fushi alone is able to defeat. Can he protect a world he is still struggling to understand from enemies with the ability to steal everything Fushi has painstakingly gained so far?

2. My Companion Is The Strongest Undead In Another World.

Yuuma, a timid college student who has been summoned to a different world. It was thought that a fun life in a different world would begin with the cheating ability given to you, but what was waiting for him was cold-hearted and cruel treatment. His body is chopped up, fear and severe pain run throughout his whole body, and it is a living hell that never ends. “Why did this happen to me…” Aside from Yuuma’s heartbreaking cry, the blessing of “immortality” continues to regenerate his body. Yuuma was made into an experimental animal of researchers who were fascinated by the possibility, but he meets a pretty girl by chance in the facility, after meeting Eva, his life in a different world begins to change greatly!

3. Sss-Class Suicide Hunter.

In the mysterious, RPG dungeon-like Tower, Confucius Kim lives a mundane existence, envying all the star hunters. One day, his wish for more is granted with a legendary skill to copy others’ abilities… at the cost of his life. Before he can make sense of it, he’s killed by the #1 hunter, the Flame Emperor! But this activates his skill and now he’s copied a new one, the ability to travel back in time upon death, so technically an immortal, right? How will Confucius use these skills to outplay the competition and rise to the top?

4. Cheat Skill "shisha Sosei" Ga Kakusei Shite Inishieno Maougun Wo Fukkatsu Sasete Shimaimashita ~Dare Mo Shinasenai Saikyou Hiiro~.

Licht, a young man who has the special ability, [Resurrection], makes his living as a member of an S -Rank Adventurer's Party.

However, the King, who feared his power, ordered his comrades to betray him, and in the end, executed him in an unfair manner.

But Licht, who was fortunate enough to be revived because of his own skill, now swears to carry out his revenge on Humanity…

5. If you don't let me die, I'll be invincible.

Ye Ning obtained the golden finger through travel, and as long as he dies, he would be invincible. So he started to go crazy. But... Empress Da Zhou: "When I see Ye Ning's life, if he dies, I will live alone.". Upper world immortal ruler: "The world is so indifferent, but Lord Ye never hates me, I will try my best to protect him". Hundreds of millions of people: "everyone in the world can be lacking, but Lord Ye is the only saint, only Ye Ning'er!" Ye Ning: I'm almost invincible, why don't you let me die?

6. Ajin.

Those who are resistant to death are called "Demi-humans". That day, Kei Nagai, a High school student, should have died in a traffic accident, but he comes back to life shortly after. In other words, Kei is a demi-human. Since then, Kei's world changes dramatically. Terrified and without knowing what is going on, Kei is saved by his friend, Kai. Together, they flee deep into a deserted mountain. Later, a group of demi-humans who are hostile against humans contact Kai… Who is he fighting against? Who should he side with?

7. Cultivator Against Hero Society.

A powerful cultivator unexpectedly time-traveled into the modern world with heroes. In this small world, the fight between cultivation and superpowers shall begin...

If you know more such manhua, manhwa, manga mention them in the comment section.