Ryusui Nanami

Before the Petrification, Ryusui lived a rich and luxurious life, making him greedy and always seen with expensive things and money around him. His personality was similar to that of a spoiled rich kid, ordering others to follow his commands. Even after being de-petrified, he remained greedy, demanding adoration and proclaiming himself the leader of the new world. Although arrogant and greedy, it was his greed that fueled his ambition and was the cause of his success before his petrification.

He spent a lot of time studying navigation and shipbuilding on small to large scales, and he invested the money he earned in it and his company. Senku deduced that his presence would be beneficial to the Kingdom of Science, as his greed could also motivate those around him. He hates seeing women and children cry. Like Senku, Ryusui has a desire to rebuild society and create a good world for everyone to live in peace.

Ryusui is a tall, muscular young man with messy blond hair that reaches his face. He has thick eyebrows and an intense gaze in his eyes, which is most often seen when he expresses things he desires to possess. He is rarely seen without a confident smile.

After being revived, he wears a red high-necked trench coat with buttons and a thick belt. He also wears shoes and a captain's hat, designed by Yuzuriha.

His petrification scar is around his right hand.

Past Ryusui and Sai were excluded from photos because they weren't the matriarch's children. He wanted to spend time with his brother, but Sai believed he wanted to use him. He was very sad when he left for India. From a young age, Ryusui loved working on bottled ships. And with his 100 million yen allowance, there was no limit to how large he could grow his collection. Even from a young age, Ryusui had grand ambitions, and his dreams would often seem absurd to those of the Nanami Conglomerate. When he was in elementary school, his uncle had had enough of Ryusui's stories, and told him he should realize when to give up, a phrase that would greatly offend Ryusui every time he heard it, as it goes against the greed and desire that characterizes him. After this argument, Ryusui's uncle would reduce Ryusui's allowance to "a mere 1 million yen." After seeing this small amount of money, Ryusui claims he doesn't know the meaning of giving up and immediately sets to work to earn more money for his desires. He began investing in the financial markets, claiming that his mere presence can generate growth in them, because people trust the Nanami name. At the same time, he would begin training and exercising with a professional trainer. Ryusui wins 100,000 yen in the Grand Prix of the "Dodgeball" tournament, showcasing his athletic abilities, all while still in elementary school.