|“||I want to change... this me who's always running away... I'm sick of her. As a soldier of Non-Killing Army... as a member of Class A... as the Pursuit Baron... Sonohara Mizuka, I will now... counterattack.||”|
—Sonohara Mizuka when she told her enemy about herself, Counterattack (Chapter 51)
Mizuka has white skin with blue eyes (Red when she is controlled by bloodlust) and long black hair with a flower hair clip. 300 years ago, she is wearing a school uniform. However, even since the Abandonment War started, she is wearing a Special Service uniform.
Mizuka has always been bullied by everyone especially Douan Taketora even since elementary school; the only one who always comes up to help her was Sakai Rihito. Ironically, Taketora was Mizuka's childhood friend way back before they started enrolling at the same school. In order to become stronger, Mizuka decided to become a soldier so that she won't rely on Rihito for help.
300 years ago, during her first day at training school, Mizuka was bullied by Taketora and he stole her stars. Soon, when Sakai Tokikaze said that he stole the stars from her, Taketora "asks" Mizuka to tell them that she indeed "willingly" gave her stars to Taketora without any violence, Mizuka had no choice but to follow what he "asked" her to do. As Taketora leaves, Jail Murdoch (who traveled back in time from the future) gave Mizuka a star in order to prevent her expulsion from the school.
A few months later, Taketora had once again stolen Mizuka's stars, which Rihito noticed it and told Taketora to return Mizuka's stars back. Taketora ignored what Rihito said, punched him and told him that he is an idiot for forming a "Non-Killing Army". Soon, Mizuka told Taketora to stop and steals Lyne Mei's stars instead. Then, Jail comes to stop her and tells her that stealing stars from other people has no value. Mizuka cried and begged Jail to give his stars to her so that she can work together with Rihito. Soon, Jail gives one of his stars to Mizuka and told her that she must have her own conviction, in order to become stronger. Then, Mizuka cried and stated she doesn't understand what conviction means. Later on, Mizuka started the sniping training while Taketora watches over her,
Abilities and PowerEdit
Mizuka's initial count number is 16000; however, when she takes on a whole different personality and draws the power from Schmelman's bloodlust genes, her count number doubles to 32000. Her count stands for persistence.
Mizuka's Ballot takes the shape of her artificial cybernetic right arm, that seemingly replaced her original arm after it was cut of by Licht during his destructive rampages.The Arm itself is much longer than her original right arm that seemingly improves her firing skills and proficiency with guns. In combat, Mizuka out of all seven Barons, she is shown to have the most equipment and weapons that she uses during battle.
- Pursuit (追撃 Tsuigeki): This is Mizuka's ability as a Red Baron, her body has been enhanced to be able to use special abilities.
- Bullet Manipulation: Mizuka's bullets are able to follow the target continuously and will not stop until they hit the target.
- Expert Marksman: Since Mizuka mainly uses guns on battle, her shooting ability has been enhanced to be highly proficient when handling a gun.
- Guns: In order to use her ability of "Pursuit" to its maximum effect, Mizuka is seen using several different guns during combat in order to have multiple "pursuers" tracking her opponents.
- Six Shooter: Mizuka is seen owning a single handed six shooter pistol. She prefers this weapon when she is not serious in battle or simply when she decides to "play" with her opponents when under the effects of Schmelman's Bloodthirst, as seen when she playfully allowed Lyne and Hina access to her gun when she forced them into a game of Russian Roulette while overwhelmed by her bloodlust.
- Dual SMG: During actual combat when she's "serious", Mizuka mainly uses dual SMG machine guns in battle in order to fully maximize her abilities and place multiple "Pursuers" against her opponent and rain down a hail of bullets against them in order to fully exploit her abilities and the advantages of her ability to fly. The Rounds of her Machine Guns are shown to be heavy and powerful enough to pierce right through solid steel armor and thick concrete.
- High Caliber Sniper Riffle: Mizuka's most destructive weapon by far is her Sniper Rifle, whose rounds are shown to be incredibly powerful and are much heavier than the rounds of her SMG's, that once shot not even Eins of the New Class A who was suppose to have superior power compared to the original Red Barons couldn't have any hope of blocking or deflecting its rounds once shot at her.
- Bloodlust: As the Red Baron, Mizuka possesses the ability to increase her count by activating Schmelman's bloodlust genes. However, the more higher the count, the higher chance she would lose her sanity.
- Flight: Mizuka is mostly seen utilizing a unique flight harness strapped into her back that possess six miniature thrusters on it that then creates six light blue colored flame "Wings", having been shown mostly utilizing it in order to not only grant her immense aerial superiority in battle but grant her a birds eye view of her opponents in order to further place her in an advantage as a gunner and sniper.
- "Mizu" means "water", while "ka" means "flower" in Japanese.
- Mizuka is the only Red Baron who can fly.
- Mizuka shares the ability of "Pursuit" with the New Class A member Vier, who is a clone of her once close friend Asumi of the original Class A.