Ryusui Nanami is the son of the patriarch of the Nanami Conglomerate, member of the Crafting and Development Team and a major player in the Kingdom of Science, along with his devoted butler Francois. His skills at navigating by sea or air makes him indispensable as one of the Five Wise Commanders. 
Ryusui is a fairly tall, muscular young man with shaggy blond hair, some strands of which fall loosely into his face. He's very rarely seen without a confident smile.
He loves his older brother, Sai

The captain of the Perseus and just hot man

Tsukasa is a tall and muscular young man with wild, brown hair that he has been growing since childhood with bits of stone near the ends, and pale skin. He has an androgynous face and is stated to be handsome though he often wears an intimidating frown on his face. His height is 195 cm.
He is a very kind, thoughtful, and polite man outside of his pessimistic ideals towards humanity. Tsukasa loves his sister Mirai more than anything in the world. He also respects Senku and is attached to him.