Takane Shishidō is the second eldest daughter of the Shishidō family, positioned between eldest sister Kazane and third sister Akiha. She is 20 years old. Takane stands 174 cm tall, weighs 53 kg, and has body measurements of 91-59-90 cm. She possesses long blue hair reaching her waist, cyan eyes, and frequently wears a hairband or hair ribbon.

Unlike her family members primarily residing in the Kirkwood colony, Takane serves as an agent for the Shishidō Foundation. She undertakes sensitive missions for the family's inner circle, often operating away from Kirkwood. These delicate assignments demand her combat expertise and discretion.

A proficient combatant specializing in close-quarters combat, Takane wields dual swords: a longsword in her primary hand and a shorter blade or dagger in her off-hand. Her agility and athleticism enable her preferred fighting style. She pilots the specialized QT-ARMS mecha RAVANA, designed for direct melee combat, standing 5.6 meters tall and weighing 9.37 tons.

Takane maintains a personal rivalry with the formidable fighter Aleida, though the feud's origin remains unspecified. Her confrontational nature extends to others, including a notable lunar duel against Honoka Kawai that resulted in the destruction of Honoka's original Wygar QT-ARMS unit. Takane's combat prowess allows her to generate dramatic environmental effects like wind, even in the moon's vacuum.

Within the family, Takane's exemption from marriage arrangements becomes a point of contention when Kazane attempts to arrange Akiha's marriage. Akiha openly questions why Takane, being older, avoids similar expectations, highlighting Takane's distinct position prioritizing operational duties over conventional obligations.

Her narrative function centers on action sequences and familial representation. She directly intervenes in critical battles affecting Shishidō family interests, operating independently and as an extension of the foundation's objectives.