Madame Horos

Swami Laura Horos, commonly referred to as Madame Horos (マダム＝ホロス), is a fraud who posed as Anna Sprengel.

Appearance
While using Anna Sprengel's body, Madame Horos appeared as a woman (between one to two thirds taller and with an older physical appearance than the actual Anna Sprengel) with long reddish-blonde hair, hung, rolled and squished into several fried shrimp shapes. She wore a gaudy red dress, looking like a leotard with a long skirt attached and partially exposed cleavage. She also wore lipstick, rose decorations in her hair and the Rosicrucian emblem on a thin chain.

Background
At some point in the past, Madame Horos managed to steal the body of Anna Sprengel and assumed her identity, impersonating her for over a century onwards.

During the time of the Golden Dawn, Madame Horos approached Samuel Liddell MacGregor Mathers under the guise of Anna Sprengel, who was said to have authorized the founding of the Isis-Urania Temple through written correspondence with William Wynn Westcott (though the Sprengel Letters were considered forgeries), and after deceiving him, made off with crucial cabal documents. This brought a disaster to the cabal and earned her Mathers' hatred, though his Belzébuth and Typhon-Set were ineffective in this case.

Over the course of the century she was inhabiting Anna Sprengel's vessel, Madame Horos apparently squandered a considerable amount of Anna's power.

Coronzon Arc
During the events surrounding the Ceremony of Mo Athair, Madame Horos approached Takitsubo Rikou as Anna Sprengel, offering her a means to help Hamazura Shiage,  but actually planning to kill him while using her. Her attempt was ultimately thwarted by the revival of the recreated Dion Fortune. After Coronzon's defeat, Madame Horos appeared before the dying Aleister Crowley, still posing as Anna Sprengel, but was ambushed by Aiwass who swiftly dispatched her and restored the real Anna Sprengel to her body.

Trivia

 * Similar to the events in the Toaru series, the real-life (who went by many other aliases as well) also managed to briefly convince Mathers that she was  and stole Golden Dawn material which she used in a scam, for which she was arrested. This event was another factor in the Golden Dawn's collapse, in addition to the internal schisms.