You are not a prince; you are Colonel Mustard's illegitimate son.  Your mother was a member of a king’s harem, but Mustard abandoned her.  She was executed when their infidelity was discovered.  You spent your childhood as a street rat and hate the Colonel with a passion, though he has no idea that you are related.

Although engaged to Countess Emerald, you are secretly carrying on a torrid affair with Miss Scarlet.  In fact, on the night of the murder, the two of you had a hasty but passionate rendezvous out in the barn.  You have told her about your hatred of Mustard – but not why you hate him.  She still thinks that you are a prince.