While everyone is piling on the "Good-aligned assassin? No way!" debate, I think I should point out that the player didn't choose Bard/Assassin, he chose Bard/Ninja. Ninja and Assassin are not 1-to-1 equivalent. Historically, Ninja were primarily spies and information-gatherers, specializing in disguise and impersonation. A ninja might occasionally assassinate someone - but doing so draws attention, so it would only be done as part of a larger plan, or if it benefited the ninja clan as a whole (e.g., silencing a nosy PC who has been publicly revealing ninja secrets). For a ninja, perfect success means no-one even suspected a ninja was present, NOT a room full of dead bodies. As Jack of Shadows pointed out, this character is essentially James Bond, or Reilly (Ace of Spies).