The half that separated from that manifested by acquiring the mold of a certain heroic spirit.
Unbefitting her childish appearance, she constantly manipulate the surrounding people with an alluring behavior.
The self-alleged "Illya’s elder sister", but because Illya herself also proclaims to be the elder sister, the quarrel between sisters that are like two peas in a pod are never ending.
At first Chloe was rejected by Illya, but she began to reside in the Einzbern house after they reconciled.
For appearances’ sake, they pretend to be cousins, but people often think they are twins due their faces being so much similar.
Even Shirou, Illya’s step-brother, mistaken Chloe for Illya when they first met.
Although this could not be helped, as he was not aware of Chloe’s existence, it seems that the fact that he could not tell them apart was quite a shock for Illya.
She has no awareness about the identity of the heroic spirit whose mold she borrowed.
She has only inherited the combat techniques which said heroic spirit cultivated.
Chloe rampantly wielded a great combat power with instantaneous thinking, but she received a curse of shared pain from Rin, who saw a threat in that behavior.
The intention was to inhibit the danger towards Illya by making her share Illya’s pain, but this imp would not stop from just this much.
A special move that a certain heroic spirit used.
An unavoidable, sure-hit combination that projects three sets of the married swords, which possesses the property of mutually pulling against each other, and hits with piled up throws and slashes.
Furthermore, since Chloe combines this with a teleportation towards the enemy’s back, one would have trouble seeing through this even with Eye of the Mind.
In order to defeat it, you have no choice but to either defend from all directions or ignore the damage and make a suicide attack towards the user himself.
Chloe, a Servant who unexpectedly manifested without a Master, constantly desires prana.
As a simple and easy method that does not involves a contract, she favors prana supply by means of contact of the mucous membrane.
She end up becoming a tanned imp who pushes in a kiss scene at any given opportunity, causing the entire living room to freeze.
"Still, this is merely a medical procedure, so please do not misunderstand---" or so she says. I see.
Illya’s sealed memories and disposition that sedimented, complexed and formed an individual personality - such is Chloe.
She is well aware.
The very fact she exists now in this world is a miracle in itself.
It may not have been in the way she wished for.
But she was still accepted by Illya and the others.
The family warmth which she thought had been stolen away was certainly there.
---so, surely that was the meaning of having been born.
Encouraging her unreliable younger sister, striking down her enemies and showing her the way.
For the younger sister that is behind her, shall one day pass over her older sister and aim for the brilliance of the distant stars.
Chloe von Einzbern's Noble Phantasm plays the song 少女よ星になれ (Shoujo yo Hoshi ni Nare; Girl, Become a Star) from season 1 of the anime.