Аодзакі Аоко

Shiki has never referred to anyone else in his life as such; that's how much he respects her.

During Mahoutsukai no Yoru (魔法使いの夜): A 17-year-old apprentice magus learning Magecraft from Alice Kuonji in Misaki Town. Aoko tries to live two completely different lifestyles, as a normal high school student during the day and acting as a Magus during the night, but Alice reprimands this as a half-hearted approach.

Aoko is a Magician capable of utilizing the Fifth Magic (第五魔法), making her the only person in the current world capable of performing its miracles. The Fifth Magic causes Aoko to go into a Redshift (赤方偏移) state, where her appearance and age are slightly changed, and her hair is turned red. Its exact domain is uncertain, but it has roots in time travel. Her usage of it is limited to localized individual time travel, but Touko, her sister, cannot believe that is the true nature of the Magic. The concept of time travel falls under the Second Magic, so it makes no sense for such an ability to now be called the Fifth Magic, but Touko decides further speculation is none of her business.

Despite Touko being a vastly superior magus, Aoko was chosen to inherit the Magic instead of her. It also holds the answer as to why she is called the "newest" Magician. She is familiar with Zelretch and the Second Magic to some extent, as she is able to classify Neco-Arc existing in the world of Melty Blood as his doing.