Mysterious Figure is Ansem the Wise I think. He is the only one who appeared in an organization coat in Birth by Sleep (Besides Master Xehanort at the beginning of the game.) Also it has been unclassified about ATW's weapons so that crosses out MX or else it would be a different weapon. So I think MF = ATW
Mysterious Figure is Ansem the Wise I think. He is the only one who appeared in an organization coat in Birth by Sleep (Besides Master Xehanort at the beginning of the game.) Also it has been unclassified about ATW's weapons so that crosses out MX or else it would be a different weapon. So I think MF = ATW