Nellie

Nellie is the Witch form of Kenko Tsukino, having been mentioned in Chapter 5 of Mary Sue Magica before appearing in Kenko Magica.

Information
''The Witch of Sanity with an insistent nature. She keeps telling her doctor and nurses that she speaks the truth, but has been restrained and is constantly given shocks to her brain. Upon death, she is fried and her supposedly maddened head explodes all over the walls of the asylum as she welcomes the sweet embrace of death.''

Sigmund
''The Sanity Witch's minion. He is the runner of the asylum, who is here to convince Nelly to return to reality.''

Florence's
''The Sanity Witch's minions. They are the nurses that assist Sigmund in trying to cure Nelly of her delusions.''

Trivia

 * Nellie is named after Nellie Bly, an American journalist that went undercover at an insane asylum to investigate the mistreatment of the patients residing there.
 * Sigmund and the Florence's are named after Sigmund Freud and Florence Nightingale respectively.
 * Though I also considered Ladislas as Sigmund's name.
 * Her Labyrinth is based off an abandoned Victorian Asylum.