HiMEs
Mikoto - Instead of having a separate cat and human, the manga has Mikoto as being able to switch between both forms at will. She switches sides frequently, initially being in the service of Schwarz only to defect to Mashiro's once Mai was revived. However, her true allegiance was to Mai, as demonstrated when she gave up the fight and disappeared along with Mai after the latter was killed and freed. She is also apparently some kind of icon, as she appears in various kinds of merchandise.
Mai Tokiha - The first HiME to be revived by Mashiro. Unlike the normally benevolent Mai, this Mai is bitter and nihilistic. The second HiME to "die", stabbed by Manshiro and the Sword of Akatsuki.
Natsuki Kuga - One of the HiMEs revived by Mashiro. This Natsuki has the largest bust of all her incarnations.
Akane Higurashi - One of the HiMEs revived by Mashiro. She assails the Otomes with tornadoes courtesy of Harry and is clad in a revealing outfit, to Akane Soir's horror.
Shiho Munakata - One of the revived HiMEs, she appears to take on her Otome counterpart, amusingly claiming to be her identical twin separated at birth.
Sister Yukariko - One of the revived HiMEs brought back to life by Fumi. She appears only very briefly, severely damaging Windbloom castle, while dressed in a revealing dominatrix style variation of her nun attire. She also seems to have an appetite for men, as she seeks them out from a crowd of fleeing people.
Nao Yuuki - One of the HiMEs revived by Mashiro. According to Chapter 39, she sees the revived Natsuki Kuga as an older sister. They are also on much friendlier terms than in their other HiME incarnations.
Akira Okuzaki - The past version of Akira, she only appears very briefly in Chapter 40, doing combat with Akira the Otome while trading barbs about Takumi.
Yuuichi Tate - First seen in a vision by Mai as the "last man standing" in a battlefield littered with the HiMEs' broken Elements. He appears in the vision world created by Fumi and Mashiro, where he makes Manshiro remember his true name, although it was never actually mentioned to the readers, and gives Manshiro the Pure White Diamond and Sword of Akatsuki. After Mai's death the two were reunited and he beseeched Manshiro to win, after which he disappeared.
Midori Sugiura - The past version of Midori. She ambushes the un-preoccupied Shizuru, but is interrupted by the other Midori before she can finish the job. Her Gakutenou can transform into a mecha-like being.
Yukino Kikukawa - One of the revived HiMEs, she is bold and domineering, in comparison to her former meek self. She very publicly has Haruka subservient to her, going so far as to tongue her neck seductively in front of a very shocked Haruka Armitage.
Haruka Suzushiro - The past version of Haruka, the one revived by Mashiro is the manga's version instead of the anime's and thus she is a HiME. To Haruka Armitage's disgust, she is subservient to Yukino Kikukawa.
Alyssa Searrs - The last HiME to be revived. She tried to bend Miyu back to her will using a gravity-altering device. However, this failed and she became the first HiME to die.
Read more about this topic: List Of My-Otome Manga Characters