Sai Nanami and Ryusui Nanami

Ryusui Nanami is a character from the anime series Dr. Stone. He is described as a tall, muscular young man with blond hair. He is a greedy navigator and leader who aspires to rebuild society.
Appearance
Blonde and disheveled hair.
Thick, arrow-shaped eyebrows.
Intense gaze
He/She usually smiles confidently.
After being revived, he wears a red trench coat, trousers, and a captain's hat.
Personality
Arrogant and greedy.
It demands worship and proclaims itself the leader of the new world.
He hates seeing women and children cry.
He wants to rebuild society and create a good world so that everyone can live in peace.
Skills
He is an excellent navigator and leader.
He invested the money he earned in studying navigation and shipbuilding.
He used his skills to create simulations.
History
Before the Petrification, he lived a rich and luxurious life.
His greed fueled his ambition and was the cause of his success.
It focused on the character Ryusui Nanami in the television special Dr. Stone: Ryusui, which premiered on July 10, 2022.

Sai Nanami (ななみ サイ Nanami Sai) is the son of the owner of the Nanami Conglomerate and the older brother of Ryusui Nanami. He is a mathematical prodigy and is said to be "a million times" better than the average person in this area. Despite this, he is a very passionate boy about what he truly likes, as he dreams of being a game programmer, demonstrating a very professional attitude when we see him hand-coding to create Dragon Quest.

Right now Sai is 22, Ryusui is 12, and you are 10 years old. (In the future, after the petrification, when they joined the scientific kingdom, Sai is 30, Ryusui is 20, and you are 18.)