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Significant plot details follow.
Isaac is a major character in Rhythm Thief and the Emperor's Treasure. He is Raphael's father, but he left his son years ago, leaving him only a coin as a clue. No one knows why Isaac left, so it leaves a lot of questions for Raphael. His story is not revealed during the game.
Three years previously, Isaac seems to have stolen Napoleon's casket and awoke him again. He seems to be now serving him.
At the end of the game, Isaac is shown speaking to the real Napoleon, and that his body must be restored before they can do what they are planning.
- Isaac left Raphael on the street and climbed into a black car.
- Isaac stole paintings to counterfeit them and sell the real ones on the black market to make money because Raphael was sick.