Kuna Mashiro is a Shinigami and Visored serving as co-lieutenant of the Ninth Division under the command of Muguruma Kensei. She was born on April 1. Mashiro looks like a young girl with hazel eyes and lime-green hair. She wears a white jumpsuit with orange gloves, boots, and a scarf, and goggles on her head. Her clothing style resembles superhero costumes from Japanese television shows. Mashiro has a childish and immature personality: she is hot-tempered, frivolous, and often throws tantrums over trifles. Her captain Kensei is often annoyed by her but tolerates it. In battle, Mashiro becomes more serious and acts like a superhero. She is a master of hand-to-hand combat, specializing in powerful kicks. Her Hollow mask has the form of a hornet or a bee. Mashiro's uniqueness lies in the fact that from the very beginning she could maintain her mask for fifteen hours without training. She can also use Cero, called Super Cero Mashiro. After the war with the Wandenreich, she returned to the Gotei 13 as co-lieutenant of the Ninth Division.
