Aoko Aozaki

Aozaki Aoko (蒼崎青子) also known as Miss Blue ("ao" means blue in Japanese) is magus and important character in the Nasuverse.

Backstory
Aoko is related to the Aozaki family and is the only present one who has control over the 5th Magic (which is called Blue). Her sister Aozaki Touko cannot use magic, but specializes in making supernatural puppets. Aoko herself has an incredible talent in magic and magecraft, having only one "channel" (Magic circuit?), but being able to do wonders with little energy. This allows her to use the 5th Magic with extreme power.

Relations and Appearances
Aoko first chronologically appears in Mahou Tsukai no Yoru as the main character.

Eight years before Tsukihime she met Tohno Shiki after he ran out of hospital he was admitted to, and was able to comfort him while he stayed at the hospital. After Shiki demonstrated his ability to use the Mystic Eyes of Death Perception, she reprimanded him and told him to value living things. She later gave Shiki a set of glasses (which she stole from Touko, and Aoko herself had made indestructible) which removed the eyes effects from Shiki's gaze.

In the game, Arcueid reveals to know her but not in a very favorable light, as she mentions that "it's probably safer not to deal with Blue in the first place".

In the Epilogue of Tsukihime. Aoko appears one more time and meets Shiki much like how she first did.

In addition, in the Melty Blood series, Aoko utilizes the remains of Wallachia to create White Len, furthermore she is the true final boss in all arcade routes in Melty Blood and Melty Blood Re-Act.