I Became the First Prince: Legend of Sword's Song - Chapter 1: Prologue

The great journey of an ordinary martial artist.“Once your habit is tainted, you have no choice but to live as a dog forever. Do not turn the wolf inside you into a dog.”

A guy became a brother of Iron man and got the ability to extract genes from anyone. Lets see how he changed the Marvel World

- Description from Novelupdates

As the final dragon lay defeated, Aaran stared at the sky while the rest celebrated.[Awaiting the gods’ response...]He clenched his fists, his heart pounding. A shred of hope flickered in his eyes, only to be extinguished like always.[The attained outcome was deemed unsatisfactory.]Aaran had seen the message for the twentieth time. He had become the gods’ plaything in their desire to witness the “perfect ending”.He regressed once again, but this time as a toddler and charm being the only stat he had.But something was amiss. The world he remembered had changed. Powers that did not exist before had taken hold of the world.Tired of following the traditional route, Aaran chose to fight darkness with darkness… as the gods’ chosen necromancer!

This crossing is so strange, death crossing, game crossing, etc. are probably barely acceptable, but why can you cross even if the fish tank is broken?

and actually passed through the magic tree in “OVERLORD” that is said to be able to destroy the world?

No! It is sad enough to regenerate into a plant. The protagonist, Ainz Ur Gong, the undead king, has also accepted the adventurer’s guild mission and wants to kill me!

I want to change my destiny! Live! I want to-surrender!

Ainz: Since he has accepted the job commission from the Adventurer’s Guild, deliberate failure is detrimental to the prestige of Ainz Ul Christine (the “surrender” button has been deducted)

actually died as soon as he crossed, but there is still a chance to return~ from the beginning of the magic tree to this world.

I must change my destiny this time! Live!

- Description from novelbuddy