Twoearle

'Twoearle (トゥアール) is a girl that comes from another world, who claims Sōji Mitsuka to be the only man with the most potential of using Tail Gear, and entrusted him one to fight the monster, by transforming into Tail-Red. She also gives Tail Gears to chosen twin-tailed girls who has the potential and oversees them.

On Volume 2/Episode 5, she joined Yōgetsu High School and formed the Twintail Club together with Sōji and Aika.

Appearance
Thouars is an incredibly beautiful young woman with long eyelashes, large breasts, delicate pink lips, and long slender legs. She has long straight silver hair that spreads out at the ends and sky blue eyes. Her clothing color is usually associated with white. She wears a lab coat and mini skirt, as well as a helmet with a faceplate at times. Her height is 161 cm and her three sizes: are B:90-W:57-H:85cm.

Personality
Twoearle is a cheerful and carefree girl. She is also obnoxiously perverted.

Background
Twoearle comes from an alternate world and developed the Tail Gear bracelet based off technology that the Ultimaguil intentionally leaked, unaware that she was being manipulated into becoming a savior for the world in order to spread the twin tail attribute across the world so the Ultimaguil could later come and harvest it for sustenance. Becoming Tail Blue thanks to the Tail Gear bracelet she made, Thouars attempted to fight off the invaders but failed as the twin tail attribute completely disappeared from her world, so she escaped to the world Soji and Aika lived in and intentionally relinquished her own twin tail attribute and created the Tail Gear that Soji Mitsuka/Tail Red uses to fight the Ultimaguil.

Chronology
In episode 2, she states that she is attracted to girls.

Powers and Abilities
As the previous Tail Blue, she would have had the same powers as Aika Tsube.

In later volumes, she regains the power to transform and becomes Tail White. Though she is only able to sustain the form for short periods of time.

Tail White's power is even greater than Tail-Red's when she is using the Ultimate Chain.

Relationships
Souji Mitsuki - In episode 6 she developed feelings for Souji and realized it.

Trivia

 * Thouars' voice actress, Maaya Uchida, performed the anime's opening theme song "Gimme! Revolution."
 * Thouars always gets beaten up by Aika Tsube, because she always annoys Aika for getting close to Soji or teasing Aika over her flat chest.
 * Her birthday is on the 17th of October.