Kuro is generally much calmer and more nonchalant than Ilya. She is devious and manipulative, picking up on subtleties about people and using them to her advantage, and she can be very brazen and unrestrained in her actions. She has experienced all of the same events as Ilya, allowing her to recall events before she manifested.
She is deeply bitter as a result of having been sealed, both towards her parents for sealing her, and toward Ilya for wishing to be 'normal.' She believes Ilya is indirectly wishing for her, the manifestation of her past as part of a Magus clan, to not exist. She places pride in the reason she was born, and wishes to follow it if she can. The idea of being called a second hand clone infuriates her due to technically coming first
She easily gets into conflicts with Ilya, fighting over any miniscule insult. Ilya often uses their connection to inflict pain on Kuro by hurting herself during these conflicts. Due to her appearance and her tendency to drain energy through kissing, it certain comedic situations and misunderstandings.
Kuro also shares Ilya's affection towards their brother. However, she is more forthright with Shirou, allowing herself to express the feelings Ilya has not been able to express. Chloe became jubilant when learning that the identity of the Archer Class Card, that was used to manifest her body, is EMIYA.
Kuro does not know the identity of the Heroic Spirit whose form she has borrowed. She has only inherited the fighting skills that he refined. She wields her formidable combat powers with reckless abandon. Rin saw this as a threat, and inflicted on Kuro a curse of shared pain perception. Kuro’s shared pain with Illya was meant to deter her from targeting her twin, but the trifling curse meant nothing to the little devil.
Having received most of Ilya's magical power, Kuro is extremely powerful, capable of using all of the Archer class' abilities to a high degree, and easily able to overpower magical girls and even Miyu's Saber class change. She has physical strength equal to that of a magical girl, allowing her to damage a wall with a towel. She is much more analytical than Ilya, allowing her to read her opponent's strategy. She can utilize basic magic like a ball of magical energy that breaks apart the ground and reversing binding magic on the caster.
Kuro also possesses the ability to teleport as shown when fighting Angelica with Shirou (Miyu's brother). The range of this is still unknown.
She generally fights with Kanshou and Bakuya in close combat, and makes use of metastasis and Projection to create other Noble Phantasms. She can create mundane objects like a chair, or more powerful objects like Fake Nine Lives, Berserker's axe-sword, using it as a shield in front of her and running at the opponent. She fires Caladbolg II as an arrow.
She has the ability to drain people of their natural energy through the act of kissing, leaving them weakened and unable to act. She has to replenish herself often, but normal people are not suitable enough for her needs. While draining several normal people still leaves her weakened, magi like Rin and Luvia or someone powerful like Miyu can provide her with enough energy alone.
She has been given a seal formed from Ilya's blood that connects replicates all physical sensations caused to Ilya onto her. It replicates all injuries caused to Ilya of them, no matter how slight the sensation, and reproduces even effects like having a cheek pulled. If Ilya, her "master", were to die, the same would happen to her.
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