Aika Tsube

Aika Tsube (津辺 愛香 Tsube Aika)/Tail Blue (テイルブルー Teiru Burū) is one of the heroines/lead characters of Ore, Twintail ni Narimasu. series. She a 15-year-old freshman of Yōgetsu Private Academy and childhood best friend of Soji whom she treats like a little brother and she is rather overprotective of him, although this is later discovered to be because of her massive crush on him. Aika has a complex with her body, especially with her flat chest. She has a violent attitude toward Twoerle who often teases her about her chest. When she first became a Twintail warrior, she was mostly hated by the public, until later when Tail Yellow joins the team. In battle, Aika has an outstanding ability of fighting as she was raised by her grandfather with martial arts. She is known as Tail Blue when she transforms, and her weapon is Spear of Water, Wave Lance (水の槍ウェイブランス, Mizu no Yari Weibu Ransu). In Vol 8, she gains Eternal Chain.

Appearance
Aika has dark blue hair and red eyes. Her long hair is styled into twintails with white ribbon, which can reach her waist. She is 157 cm (5'1").

In the 16th volume, Aika is transformed into a little girl similar to Tail Red.

Personality
Aika has the personality of a normal high school student and is by far the most down-to-earth member of the main cast, often finding herself speechless before the ridiculous antics happening around her and takes more time than anyone in the Twintail Club to accept the supernatural elements appearing in her world, leading her to become the 'straight man' of the group.

She is also pretty abrasive when she feels that her position with Soji is threatened when Thouars is doing something 'stupid' (sometimes both at the same time) or provoking her for her flat-chest in both civilian and tail forms, resorting to violence and threats against the perpetrator.

She harbors feelings for Sōji and often displays this in a tsundere fashion. When she was hypnotized she even had an erotic vision of being in bed with him. She is often prone to jealousy when he interacts with other girls and was even downhearted learning Sōji got engaged.

Powers and Abilities
Her weapon is Wave Lance and her deathblow is Execute Wave.

Since at a young age, Aika has learned martial arts from her grandfather, and her main ability is to attack high places from even the lowest grounds. She gained the Tail Gear and transform into Tail Blue (テイルブルー) the time Sōji gained his power.

Eternal Chain
Aika's Chain form as Tail Blue where she gains more armor and an increase in power.

Sōji Mitsuka
Sōji is Aika's childhood friends whose rooms are facing to each other's where she lives next to him and they seemingly have been together ever since then that they are able to talk every time, although it has been hinted that she has feelings for him, but the latter doesn't seem to realize it.

Trivia

 * Aika's birthday is August 8.
 * In Episode 1, it is hinted that Aika's favorite food is curry.