The original madame X could have been a few people. First off madame X could have been hazuki. Personally I think Hazuki got too old to be madame X but she is always a possibility. Second Madame X could have been a personalized garufan doll similar to kanon. this to me makes sense because the doll could be used in place of a human until they found a person like saki to become the madame X. 3 Maria Madame X the first seemed to know quite a bit about the light before Melia even used her powers and the only pre melia light that wasn't in the unown dimension was maria.