Ciel

One of the heroines in Tsukihime. An unidentified, mysterious upperclassman. Glasses.
She is the newest member of the Church's inquisition force, the Burial Agency, and is tasked with punishing the Dead Apostle Roa.
She infiltrated Shiki's school because she suspected him of being Roa's reincarnation, but in the process of observing him she ended up being charmed by him instead.
It wasn't something as simple as falling in love, of course. It's just that she was moved by the fact that Shiki could lead such a carefree life despite having experienced death just like she had.
Due to a certain contradiction, she is an existence that cannot die no matter what happens. She is trying to destroy Roa in order to resolve this state of affairs.
She has excellent reflexes, and is number seven in the Burial Agency despite her young age.
In the Church, where magecraft is officially forbidden, the knowledge of magecraft she inherited from Roa is regarded as highly useful. However, Ciel herself hates drawing on Roa's knowledge.
Within the Burial Agency she is known as “Bow,” due to her preference for using projectile weapons.
She fights using all sorts of projectiles—not just throwing swords, but guns as well. In fact, the one responsible for changing the Seventh Holy Scripture from a beast's horn into its current shape was actually Ciel. It's possible she went a little overboard with the customizations.
Before she was part of the Burial Agency, she was the daughter of a baker. Her dream was to become a cake maker.
Believe it or not, she was originally conceived of as an older-sister type character.
Her design was hard to pin down, too. Every time we were close to making a decision, it would suddenly change again.
By the way, apparently the reason she likes curry so much has something to do with her very first mission.

Tsukihime Data Collection: Tsukihime Dictionary
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Her real name is Elisia. She is Shiki's upperclassman, and known as Ciel to him. She awakened as a Dead Apostle in the past, and was once struck down by Arcueid, but for some reason her body can't die. In Melty Blood that situation has already come to pass and is no longer an issue, so she is simply an amazing person in the game (even the great detective Hayakawa Ken is surprised by her…). She is the seventh ranking operative of the Burial Agency, and uses so many projectile weapons that her nickname is “Bow.” It was Ciel herself who customized The Horn of the Beast into its current form, The Seventh Holy Scripture.

MB Official Strategy Guide: Melty Blood Glossary
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One of the heroines in Tsukihime. A mysterious upperclassman. At the beginning of the game, she planted a suggestion in both Shiki and the players' heads that she was just an ordinary, strangely named senpai that they already knew. Also, glasses.
In truth, she is the newest member of the Church's inquisition force, the Burial Agency, and is tasked with punishing the Dead Apostle Roa. She infiltrated Shiki's school because she suspected him of being Roa's reincarnation, but in the process of observing him she ended up being charmed by him instead. It wasn't something as simple as falling in love, of course. It's just that she was moved by the fact that Shiki could lead such a carefree life despite having experienced death just like she had.
Due to a certain contradiction, she is an existence that cannot die no matter what happens. She is trying to destroy Roa in order to resolve this state of affairs.
She boasts excellent reflexes, and is number seven in the Burial Agency despite her young age. She's not just skilled in martial arts, though. The knowledge of magecraft that she inherited from Roa is equivalent to that possessed by a magus of the rank of Grand—the highest rank in the Association. Even in the Church, where magecraft is officially forbidden, this is regarded as a highly useful asset. However, Ciel herself hates drawing on Roa's knowledge.
Within the Burial Agency she is known as “Bow,” due to her preference for using projectile weapons. She fights using all sorts of projectiles—not just throwing swords, but guns as well. In fact, the one responsible for changing the Seventh Holy Scripture from a beast's horn into its current shape was actually Ciel.
Before she was part of the Burial Agency, she was the daughter of a baker. Her dream was to become a cake maker, and she already had some skill at making sweets.
…Though it seems she has no interest in making Western-style sweets anymore, on account of it dredges up memories of the past.
Her reputation as a curry lover has grown with each successive appearance, and at this point her name itself is synonymous with the stuff. As for why she loves curry so much, Takeuchi made a manga about it. It's probably about half true.
Always seems to end up playing second-fiddle to the other heroines. Maybe it's because of her magnanimous, all-forgiving nature?
Oh, well, at least her hand-to-hand combat action in Melty Blood ended up being really cool, since she was conceived of as a battle-type heroine from the very start.

Tsukihime Dokuhon Plus Period: Tsukihime Dictionary Revised
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An upperclassman at Shiki's school. Due to her gentle, polite speech, the way she always lends a helping hand to those in need, and her ability to comfort those in grief, everybody at school considers her a person of integrity even more reliable than the teachers.
In reality, she is an executor sent by the Church to stamp out heresy, and a member of the organization known as the Burial Agency.
She possesses combat ability specialized for fighting vampires, and her own potential also exceeds the realm of humans.
However, she is not a mere brute—her skills as an intelligence agent are quite high as well. For instance, she can implant suggestions using magecraft. It's because of this that nobody around her gave the name Ciel (which by all rights should have raised some eyebrows) a second thought.
Though she came to Misaki hunting a certain Dead Apostle, once there she encountered an even bigger prize: Arcueid Brunestud. As Arcueid's ally, Shiki should have been her enemy, but they nevertheless became friends.
Also, she's such a huge curry lover that she'd be happy eating nothing but curry rice with curry udon for lunch every single day. Ever since coming to Misaki, the Indian Curry House Messiaen has become something of an oasis for her.

MB Act Cadenza PS2 Manual: Tsukihime Dictionary