Atlanta

Atlanta is an Apostle of Lexington first (chronologically) seen in Rance IV and later seen in every iteration of the Toushin Toshi series up to date. In Toushin Toshi, she is mentioned upon the collection of 6 Mirror Fragments by the girl within. She is also a fight on floor 6 of Toushin Toshi when rescuing Yayoi's servant. In Toushin Toshi II, she serves as a minor obstacle on the third floor of the dungeon, preventing you from getting to certain key locations on the map until certain story prerequisites are met. On the 8th floor, she serves as a much more immediate obstacle, and finding the true Atlanta will allow you to continue on floor 8 (though floor 8 is entirely optional).

Trivia

 * Though she's called a Devil in Toushin Toshi and a witch in Toushin Toshi II, she is first formally introduced in Rance IV and is really an apostle.