Windbloom
Aoi - A maid in the Windbloom palace. Her role is severely reduced from the anime, dropping down to only one appearance in the very first page.
Sergay - The Prime Minister of Windbloom (as opposed to be of Artai in the anime, however he was still originally from Artai). Also not Nina's adoptive father. He comes across as more sinister than his anime version, but the true extent of his evil is not revealed until late into the plot.
Yukino - Not the President of Aries here, which is "given" to Natsuki's mother, but instead a member of the Windbloom police and Haruka's partner. Proficient with a sniper rifle, as she demonstrates in Chapter 11 by hitting the control GEM for a Slave.
Haruka Armitage - Not the Otome for Aries anymore, she is instead a member of the Windbloom police force and Yukino's partner. She has a pendant for heavy artillery and a dislike of Otome.
Takeda - A member of the Natsuki Fanclub. He has one appearance in Chapter 13, where he tries to meet Natsuki. However, he is caught by Chie and Shiho while sneaking around Garderobe and accidentally trespassing while Erstin is showering. Shizuru shows up with a large pair of scissors and his last panel in the chapter has him begging for mercy. It is implied that he was castrated. He has another appearance in Chapter 28, once again looking to meet Natsuki, but is captured by Haruka after being mistaken for a member of Schwarz.
Mimi - A child Erstin finds while looking for Manshiro after he runs from one of Sergay's assassins during the coronation. She aids Manshiro by bringing him and his retinue to the safety of a slum.
Read more about this topic: List Of My-Otome Manga Characters