CodeΩ33 Carene is a tactical-grade decisive battle android from the White World. Her primary designation is that of a combat unit, and her entire construction has been optimized for battle. As a result of allocating most of her resources toward combat abilities, her language functions are notably underdeveloped and have been partially sacrificed to enhance her fighting capabilities. Despite this limitation, she possesses a powerful ability known as Space Distortion Exceed.

In terms of personality, Carene is described as being extremely dry and matter-of-fact in her interactions with others. She does not display warmth or emotional attachment to most individuals, functioning in a very logical and mission-oriented manner. However, this cold demeanor has one very significant exception. Her motivations and the core of her character revolve entirely around her relationship with her sister unit, Xenia. Carene adores her younger sister unit above all else, and her affection for Xenia is intense and all-consuming. This bond is not merely a preference but the central driving force behind her actions and her very existence as a character.

Within the story, Carene operates as a formidable combatant representing the White World. Her role is frequently defined by her partnership with Xenia. Her key relationship is solely with her sister, and every other interaction is filtered through the lens of this connection. The depth of her devotion to Xenia manifests in several ways. She is fiercely protective, declaring she will never forgive any enemy who attacks her beloved little sister. Her affection extends to intimate caretaking rituals; she takes great pleasure in performing maintenance and washing on Xenia, attending to every detail with visible excitement, such as during shared baths where she cuddles her sister as floating hearts appear around them. She finds Xenia so precious and cute that she claims she can hardly breathe.

The character experiences notable development through her understanding of love and unity. Carene initially believed that the ultimate bond meant becoming one entity. She thought that Stella's bond with her A-driver was weak precisely because they were not fully fused together. Her own desire was to fuse permanently with Xenia, to share and understand everything about her so they would never be apart. Yet, a crucial development occurs when she realizes the limitation of this goal. If she and Xenia were to completely fuse into a single being, she would lose the ability to physically express her love through hugs, no matter how much she loves her sister. This leads to the understanding that Xenia's existence as a separate entity is precisely what makes her so precious. In one instance, when another character, Clara, finds her words complicated, Carene simply responds that Clara will understand when she grows up, indicating a wisdom and emotional maturity beneath her limited speech patterns.

Carenes notable abilities include her classification as a tactical-grade decisive battle android, meaning she is a high-level combat unit designed for significant strategic engagements. Her specific power is the Space Distortion Exceed, which implies an ability to warp or manipulate spatial dimensions in combat. Her limitations are linked to her emotional attachments. During a confrontation where she attempted to accelerate to defeat Stella, she was unable to push herself to the maximum limit because doing so would have resulted in her sister Xenia being destroyed along with her. Following her defeat alongside Xenia, the two remained physically connected, reinforcing the inseparable nature of their bond.