"I don't want to! I'm hungry, and it's hot, and this is boring!"

Mashiro Kuna is the co-lieutenant of the 9th Division, currently under Kensei Muguruma and is currently a member of the Visored.

Mashiro's appearance is that of a young woman with hazel eyes. She wears a white bodysuit with orange gloves, boots and scarf, along with a set of goggles atop her lime green hair. Her overall style of dress is reminiscent of the costumes worn by the Tokusatsu superheroes in late 1970s Japanese television shows.

During her time in Soul Society, she wore the standard Shinigami robes, though her sleeves were very long. She also wore a pink scarf and a pair of glasses perched atop of her hair, which was wavier then.

Seventeen months after the defeat of Sōsuke Aizen and having returned to Soul Society, Mashiro wears the standard Shinigami shihakusho, while keeping her goggles, orange gloves and boots from her time in the Human World. She also wears a custom made badge on her arm that has a 9 on it and the word Super.

Despite having formerly attained a position in the elite Gotei 13, Mashiro has very childish and immature mannerisms. She is portrayed as rather flighty and rarely takes note of the bigger picture around her. She is prone to throwing fits over the smallest of things, such as Orihime Inoue befriending Hachigen Ushōda or when Kensei insisted on following his subordinates into battle. Her childish personality frequently irritates her Captain Kensei, causing him to question why he kept her as a lieutenant at the time; he has noted she is capable of annoying him even while asleep. Mashiro is an air-head and shows many comedic acts.

In battle, she is somewhat more serious though, acting slightly like a superhero while attacking and after winning.

The Visored are a group of Shinigami that have acquired Hollow powers. Following the battle at the Fake Karakura Town, some members rejoin the Gotei 13, resuming their former positions as captains.