In a FNAC4 teaser, we see the word forget about me.

Which is Mary trying to communicate through forgotten candy to Marylin telling her to forget about her to accept that she's dead

Now it makes a lot of sense of him to be called "forgotten candy"

In fact, Mary could be the soul inside FC (Forgotten Candy) and hypothetically, her mechanic in her game could be a generator charger (another hypothetical mechanic).