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Besides the classic image of a criminal mastermind, I want to use the image of Basil Blackspot. In my AU, Basil is a well-known person and, perhaps, he recently arrived/moved to Mouseton. And the meeting with Mickey will happen either because of his fame or because of Basil's specific field of activity.
Maybe Basil will be an editor of a scientific magazine? It would be a cool reference to the comic book series about the reporter Goofy, mixed with the Phantom's knowledge, skills and abilities in scientific fields. Just imagine: a magazine editor by day, and a terror of the criminal world by night!
And it would be interesting to think about the interactions between Mickey and Phantom Blot in this vein.