While few would claim that witnessing the death of a character is joyous, there is a quality of joy in being a part of that story. Equally in games without story (such as pet simulators) caring, fostering and protectiveness are often key parts of the experience. These in turn might be described as kind of joy, though sometimes perhaps in retrospect.
Empathy could be defined as: The joy and sorrow which comes from emotional attachment to characters in the game.
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