Mashiro Kuna is a member of the Visored that are capable of Hollowfication, and she was the former lieutenant of the 9th Division in the Gotei 13.
It was 100 years ago that Mashiro Kuna was a lieutenant in the 9th Division of the Gotei 13, under the command of Captain Kensei Muguruma. Kensei had been tasked to investigate a rash of disappearances of other Soul Reapers within the Ruko District. Mashiro's constant complaints about the mission greatly irritated Kensei. When he told her that she wasn't even asked to come, she claimed as his lieutenant that she had to join. It was while she was throwing a fresh tantrum about being hungry that she discovered the empty clothes of ten Soul Reapers.
Later the next night, Mashiro was soundly asleep but still aware enough to catch Kensei's hand as he tried to fix her robe. The teams were attacked that night by the traitor Kaname Tousen, and the Gotei 13 never heard back from them. A search party was formed to look for Mashiro and her team made up of various Captains and Lieutenants, but they all fell into a trap. Mashiro and Kensei had been infected with the powers of the Hollow. They were mad and attacked the team that came to save them. While Rōjūrō Otoribashi and Lisa Yadomaru fought the hollowfied Kensei, Mashiro attacked Rōjūrō from above and slammed him into the ground, then turned to attack Captain Shinji Hirako. Her rampage was only stopped when Lieutenant Hachigen Ushōda with binding Kido.
Just as it seemed the chaos was coming under control Hiyori Sarugaki began to hollowfy, and they were all cut down by Tousen, who had been watching in the distance. It was revealed that he was aiding Lieutanant Sousuke Aizen as part of his experiments. Before they were all killed, Mashiro and the rest were saved by the appearance of Captain Kisuke Urahara and the Kido Corp's Tessai Tsukabishi. Aizen escaped, and Mashiro was taken to the 12th Division with the rest of the infected so Urahara could try to save them with his invention, the Hogyoku.
Before Urahara could cure them, both he and Tessai were arrested as the culprit who attacked them. Mashiro and the hollowfied Soul Reapers were sentenced to be destroyed. They were saved by the 2nd Division Captain Yoruichi Shihoin and put into a safe hiding place while she freed Urahara and Tessai. They were all taken to the Human World so they could hide. It's unknown how long it took Urahara to help Hiyori and the others. They weren't cured, but were able to regain their personalities and control their Hollowfication. At some point, the group separated from Urahara and went into hiding on their own in Karakura Town to form the Visored.
The character of Mashiro Kuna is a supporting character of the BLEACH series that was created by Tite Kubo, It first began serialization in Weekly Shonen Jump in August 2001. She was first introduced during the Arrancar story arc story arc that began in Volume 21.
She first appeared in BLEACH Volume 24, CH. 214 "Immanent God Blues", and her first anime appearance was in BLEACH - Episode 122 "Visored! The Power of the Awakened". Her character in the Japanese series is voiced by Akemi Kanda, and the U.S. dub produced by VIZ Media is done by Laura Bailey.
"You're so dumb, Kensei. You have no idea how long I can stay Hollowfied! 15 hours. 15 hours! I could keep this up all night!"
Mashiro Kuna "BLEACH" Vol. Ch. 376
Mashiro Kuna has the physique of a petite young woman, but the innocent personality similar to a child. She is both kind and playful, but quick to tantrum when she doesn't get her way or is ignored. She has short green hair and hazel eyes. As a Soul Reaper, she wore a normal robes with overly long sleeves, and a pink scarf around her neck. Her hair was both short and choppy and she wore tinted glasses on her head. While in the human world, she wears a skin tight white outfit that resembles the clothes worn in the Kamen Rider hero series that were highly popular for masked heroes in the 1970's. The only difference in her hair is that he's smoothed straight and she wears goggles.
Birthday: April 1
Height: 153 cm (5'0")
Weight: 44 kg (97 lbs.)
After being abandoned by the Gotie 13, Mashiro and the other Visored look to the Soul Reapers as their enemy, but still feel they own a great deal of gratitude toward Urahara for trying to save them. They mostly likely kept hidden before to avoid being tracked down and killed. It's unknown where Mashiro and the rest of the Visored are after the events of the war.
Mashiro was among her Visored members at their warehouse hideout in Karakura Town when Ichigo Kurosaki came to them. He rejected their offer to join them and thought he could use them to train to control his inner Hollow. Shinji Hirako fought Ichigo while Mashiro and the others watched. Mashiro couldn't understand why he was so afraid to use his hollow. Hiyori Sarugaki replaced Shinji to push Ichigo, and it worked. His hollow appeared, but he went made and caught Hiyori around the neck. She was saved when Mashiro and the other Visored pounced on him.
After Ichigo got fed up with his training, he was taken to their basement training grounds. There he was put in a barrier to undergo taming his hollow. Mashiro and the others went in turn to fight Ichigo's hollowfying physical form while he had his internal battle with his inner hollow. It was Mashiro that had taken the longest in this training. He managed to tame it just before they were forced to kill him.
As the training went into a month, but Mashiro didn't understand why he had to train further. This was because she has always been able to use her mask for 15 hours from the start, and she teased Kensei for not remembering that. They were soon visited by Orihime Inoue, who managed to both track Ichigo and walk through Hachigen Ushoda barriers. Orihime left after talking with Ichigo, but Hachigen asked Hiyori to bring her back. Mashiro threw a tantrum over Hachigen's new friendship with Orihime, but Kensei explained that they had similar powers. It was like meeting a distant relative for Hachigen. Ichigo left their training after more Espada attacked and Orihime was abducted by Sousuke Aizen's forced.
The Visored managed to escape being transported to the Soul Society with the rest of the real Karakura Town. The Gotei 13 realized Aizen's goal was to destroy Karakura Town and it's people to create a copy of the King's Key. A fake copy of the city was put in it's place. They sat in hiding and waited for their chance to strike while Aizen and his Espada fought the Soul Reapers from the Soul Society.
Just as things were looking their worst for the Gotei 13, Mashiro and the Visored made their appearance into the battle. Not to help them as much as it was to fight Aizen and help Ichigo. When Aizen summoned several Gillian hollows, Mashiro and the others summoned their hollow masks. Lisa sliced the giant head of one with her sword to destroy it in an instant. Mashiro almost effortlessly destroyed four of the Menos Grande with her "Mashiro Kick", leaving an explosion in her wake. She got angry with Kensei, because she wanted to take out the last one. She then turned her attention to the Espada, Margera Wonderweiss, but dealt a devastating kick to the gigantic Fūrā above him.
Wonderweiss attacks Mashiro for killing his pet, but Mashiro double kicks him to the ground before he can fire his Cero at her. She even struck a pose for her apparent victory. She's distracted by seeing in the sky as Aizen betray his own Tres Espada, Tier Halibel. She neglects to see Wonderweiss has revived next to her, but manages to send him flying with a kick after a warning form Kensei. He tries to warn her not to push her limit with the mask, but she angrily tells him that she can keep this up all night.
Back to fighting Wonderweiss, Mashiro grabs him and throws him him into the ground. Unfazed, he grabs her by the scarf and flings her away by several blocks. Angered he ripped her scarf, she fires her "Mashiro Super Cero", but he cancels the blast. As Mashiro rushes in for a close attack, her mask suddenly shattered. Wonderweiss uses that opening to deal a barrage of devastating punches to Mashiro's face. He's stopped by Kensei, and he takes Mashiro to lay her down on a nearby rooftop. With a grin, she asks if he's going to avenge her, but he tells her not to be so happy since he did warn her. Kensei goes into Bankai to fight Wonderwiess and destroys him.
Ichigo eventually returned from Hueco Mundo and defeated Aizen, but at the cost of his Soul Reaper powers. Mashiro and the other Visored have their injuries treated before leaving. Mashiro and the rest of the Visored have not been seen since.
Despite her childish personality, Mashiro possesses exceptional skill and power as a lieutenant in the Gotei 13. The advantage of hollowfication gives her an incredible boost in power that no other Soul Reapers can.
The process of Hollowfication is a unique ability that was a side effect of one of Aizen's experiments on Soul Reapers. It gives the user the ability to summon a Hollow mask that greatly increases all their attributes. Their spiritual pressure, strength, and speed are all augmented. The training to control hollowfication is not easy, as it requires a person to tame their inner hollow before it can be controlled; then the use of the mask is limited by time. Mashiro's time limit is 15 hours.
The shape of the mask is unique to each person. Mashiro's mask is in a form a heart shape with several eye holes and two antenna. The cute bug style of mask is reminiscent of a Kamen Rider heroes. Mashiro has shown that she has the longest use of the mask among any of the other Visored. Her limit has been 15 hours from the start, but was drastically shorter due to her overexertion in the battle against Margera Wonderweiss.
When she was originally shown in full hollow form 100 years ago, not only was her face covered by a mask, but her legs were also surrounded by an armor. After taming her inner hollow, she hasn't been shown to be able to summon the rest of this armor.
The Zanpakuto is the unique sword of the Soul Reaper. Though, not much is known about Mashiro's zanpakuto since she's never seen using it in combat and has only been briefly shown in the series. The sealed form is the first stage of the zanpakuto. In this form it merely appears as an elegantly crafted katana with a straight blade. The guard is rectangular with circles on each point. The handle is wrapped in green cloth. Her zanpakuto's special abilities have never been displayed, and it's also unknown where she keeps it while she fights hand-to-hand.
Mashiro Kuna is a popular character in BLEACH and has made numerous appearances in the different products based on Tite Kubo's original manga. These include the anime, animated movies, and video games.
Lisa has made her appearance in the anime series of Tite Kubo's BLEACH.
Mashiro Kuna has made no appearance to date in any of the BLEACH series of feature films.
As a series based mainly on fighting and battles, Mashiro Kuna has made several playable appearances in the BLEACH series of games. Mashiro''s game debut was in BLEACH: Heat of the Soul 6 (2009) for the Sony PSP. She appears frequently in the Heat of the Soul series, and she uses her zanpakuto. It was in BLEACH: Heat of the Soul 7 (2010) that Mashiro can use her hollow mask and fire her Mashiro Super Cero attack.
(For a full list of games that feature Mashiro Kuna, see her profile on Giant Bomb. HERE)