Tsubaki Shinra

Tsubaki Shinra is the Former Vice-President of Kuoh Academy's Student Council and Sona's Queen. She is the fourth most popular girl in the Academy.

Appearance
Tsubaki is a young bespectacled woman with long straight black hair that extends all the way down to her knees with split bangs and heterochromic eyes, with a violet left eye and a light brown right eye (both light brown in the anime).

In addition to wearing the Kuoh Academy girls' school uniform, she also wears blue, semi-rimmed glasses with square lenses.

Personality
Like Sona, Tsubaki has a serious personality and is rarely seen smiling. She also cares deeply for her teammates and is very loyal to Sona. After falling in love with Yuuto Kiba, Tsubaki is shown to be very shy when around him to the point where she loses her usual calm demeanor. She is noted to like younger boys who would make her serious, making Yuuto a match in a sense.

History
Tsubaki was born in the Shinra Clan which has ancient and honorable origin that purifies evil spirits, but due to her trait that calls out to abnormal beings through her mirrors, she received a state which was basically isolation from the other members. She eventually overcame that by becoming a Devil under Sona, and changed the mirror to her own powers, which became her Sacred Gear, Mirror Alice. She then enters the Kuoh Academy along with Rias, Akeno, Sona and Kiyome, becoming the Vice Student President in her third and final year.

Birth of the Breast Dragon Emperor
Tsubaki first appears in Volume 3 when Sona introduces her peerage to the Occult Research Club. When Kokabiel decided to attack Kuoh Academy, Tsubaki and the members of the Student Council assisted in forming a barrier to surround the school while maintaining it from outside.

In Volume 5, she, Yura, and Meguri faces against both Yuuto Kiba and Xenovia on separate occasions during their masters' Rating Game. While she manages to defeat Xenovia, she failed to gain the upper hand against Yuuto by sword skills alone. She was force to retreat during her one-on-one duel with Yuuto after the interference by Akeno when the latter started to use her Holy Lightning. Tsubaki was then chased by Yuuto who fought her one more time revealing the Durandal lent to him by Xenovia, allowing Yuuto to use the holy aura from Durandal to defeat her.

The Heroic Oppai Dragon
In the student council room Issei was told by other members of student council that she has fallen in love with Kiba after her defeat to him in rating game. In Volume 12, she and the rest of the Student Council were protecting the children of the Underworld from Heracles and Jeanne from Khaos Brigade's Hero Faction but was at a disadvantage due to the two of them using the children as hostages.

The Legend of Oppai Dragon and his Lively Companions
In Volume 14, Tsubaki assisted the Occult Research Club in the rescue attempt after their first year students were kidnapped by Khaos Brigade and the Stray Magicians.

In Volume 16, along with the Student Council, Tsubaki participated in the meeting for the formation of D×D.

As Sona's Queen, Tsubaki assisted in the experience day of the school her master built in Volume 17. When Qlippoth launched their attack, she was partnered with Yuuto to help defend the school from the mass-produced Evil Dragons.

In Volume 18, Tsubaki along with the rest of the Sitri group took part in helping with the Christmas Project. Tsubaki also received an e-mail from Issei asking if she would like some cake that Kiba planned on making later.

Tsubaki participated in the fight against the exorcists that rebelled against the Church in Volume 19. She and Tsubasa managed to block the barrage of range attacks coming from the exorcists using their Sacred Gears. Tsubaki also used her subspecies Balance Breaker, Nostalgia Mad Tea Party, that was able to defeat most of the exorcists without harming them.

In Volume 20, when the location of the stolen city Agreas had been found by team DxD, Tsubaki and the entire Sitri Peerage along with Dulio and Griselda to be sent in first as a diversionary unit where they had to fight against members of Qlippoth.

In Volume 21, the Sitri team were sent to the Underworld to stop the rebels led Bedeze Abaddon, who was trying to push the blame of the corruption of the Rating Game onto the Bael clan. As soon as they heard news of Trihexa heading towards Japan Tsubaki and her teammates travel to the Human World to join the battle against Qlippoth.

Powers & Abilities
Demonic Power: As a Queen, Tsubaki possesses all the powers of a knight, rook, and bishop thus giving her enhanced speed, strength, defense, and magical power.

Master Naginata Wielder: Tsubaki is a master of naginata capable of rivaling Yuuto and Xenovia.

Reverse : A type of magic that turns the effects of any power or object into it's opposite. Tsubaki attempted to reverse the properties of the Phoenix's Tears on Yuuto but was unsuccessful.

Equipment
Mirror Alice : Tsubaki's Sacred Gear. It creates a mirror that if destroyed reflects double the damage on the attacker, but cannot be summoned twice in a row without a cool-down period. In Volume 17, it has evolved to the level where multiple of them appears at the same time.
 * Nostalgia Mad Tea Party : Tsubaki's subspecies Balance Breaker that allows her to summon three demons that have different abilities from her mirrors. The conditions to activate this Balance Breaker is to use Mirror Alice to perform a certain number of counterattacks.
 * Dormouse : A demon that has the form of a large rat that expels sleeping gas from its mouth.
 * March Rabbit : A demon that has the form of a rabbit in a suit that forces enemies that were affected by the ripples made by the rabbit bouncing to enter a frenzied state.
 * Mad Hatter : A slender demon that wears a hat which shows hallucinations to those who look at its eyes.

Naginata: Tsubaki's primary weapon that she uses in battle.

Trivia

 * Tsubaki's height is 170 cm. (5 feet 7 inches) according to the visual book with her data.
 * Tsubaki is the only known Queen that uses a Sacred Gear.
 * Tsubaki is the Japanese word for camellia flower.