It was a normal life. In a world called "Earth" a boy was born. He went to school, graduate, got a job, retire, and finally died. His life was plain and boring. The only interesting about him is probably his isolation and his choice to not have a wife.
As the man lay in his death bed with his nephews and nieces. He dreamed of a shooting star that fuse with himself and bought him to another world.
It was true, at the man's death bed, a natural treasure born from the life and death of multiple multiverses was born. These type of treasure will fuse with a lucky person, giving them random gifts and the ability to go to other multiverses. These beings were known as "Wanderers". They might be good, they might be evil. They can be as weak as an ant or as powerfull as celestial beings. Some have the ability to create anything with just a thought while some have the ability to control fire. The only thing that they have in common is the vast potensial of their ability and their ability to travel the multiverse that they can use instinctively when they became strong enough.
Just like a being known as "Pig Farmer" who was just a normal human farmer who was granted the ability to nurture mammal type creatures such as making them healthy or breed faster . The only problem was that he was bought by the treasure to a world filled with only pigs and plants. Luckily he manage to use his ability to the fullest and turned a pig into a being called pig planets which are pigs that are as bug as planet and have a whole planet ecosystem inside their stomach. He also evolve himself and was given the title "Pig Farmer" due to all his powerfull pets being pigs.
As for the man in his death bed. His ability was quite special. Usually the treasure will fuse with beings that are in their prime and teleport them into another world. However this man was about to die when the treasure fuse with him. Luckily for him the ability given by the treasure was powerfull enough. It was called "Another life" this ability grant him the ability to reincarnate to a random multiverse. The only downside is that during each life, his memories will be hidden and can only be access when he gets stronger. Luckily even if his memories was hidden, his personality that he grew from his hundreds of lifes was not.
And so the man live hundreds upon thousands of lifes. In one of his lifes, he became a tree that grew so high that the intelegent race living in that world cut him down. In another life he became the lord of fire known as Vulcan. In another life, he became a scientist that defeated another world that was trying to devour his world. In another life, He became a god of crafts. In another life, he became an ugly green goblin who was killed by a hero. These lifes was random. In some he became a hero. In another he became a girl. He even became an intelligent rock.
And this time in a world filled with swords and magic where something called the voice of the world grants a thing called skill to it's inhabitants. The man, The legend who in one of his life became a girl was reborn as a...