There are 4 characteristics of full karma for any action. Intention, preparation, performance and, finality. For example, if a person were to commit a robbery, they would have to hatch the plot, prepare for the robbery, steal from whatever source they ve selected, and get home safely with all the money. These 3 actions, also referred to as white, black and mixed, produce various results. All positive karma is virtuous as all negative karma is non-virtuous.
Mixed karma can go either way, depending upon the circumstances.
If the actions one has done in the past are negative, rebirth into hell, hungry ghost and animal realms is the result. For positive past actions, the realms of the gods, demi-gods and humans are where someone is sent. Completing karma is what one achieves in each lifetime. If a person is born into the human realm with numerous physical ailments, that negative completing karma is being realized. The same holds true for those born into great wealth and fame.