Despite his goofy nature, Sakamoto is actually a successful businessman in the galaxy. He believes that business is a way of protecting his country. He has a private, well-equipped defensive business fleet. He believes that sacrifices should be made for the good of the community, which is why he chose to abandon his comrades on Earth to travel into space. Sakamoto is shown to be skilled with a pistol in an anime filler episode. His name is based on the historical character Sakamoto Ryoma.
Sakamoto speaks in Tosa-ben, much like the inspiration for his character, Sakamoto Ryōma.
Sakamoto's birthday is November 15, and he is in his twenties. He is 181 centimeters, and he weighs 70 kilograms.