The Streets Of Hammerfast
Alignments are general statements about what your character believes, not hard and fast rules about how your character should behave.
Alignment is listed on a scale from -5 to 5, with good at 5, evil at -5, and unaligned at 0. If you consistently play your alignment, you’ll stay where you are. If, during the course of the game, you decide that your character has changed their beliefs, you can move along the scale. If you consistently play against your alignment, I’ll let you know that you should probably be moving.
Good characters are guided by a set of morals. It is up to you to define exactly what this set of morals is, and how rigidly your character sticks to it, but in general, you believe that the strong should protect the weak, and that you should not kill without justification (this justification only has to satisfy you, so it could be as simple as “he looked dangerous”, “kobolds are an abomination unto Reggie”, “he cheated at dice”, etc.).
The character feels no particular compulsion to follow any particularly code of ethics, but simply acts in his or her own interest. There may still be some things that the character considers “wrong,” but he doesn’t feel that he must act to correct them. (e.g. An unaligned character may believe that slavery is wrong, but may accept it as a necessary evil.)
The character is willing to do whatever it takes to achieve his or her ends. Murder, torture, and extortion are all valid options. Evil characters can range from the average highwayman killing travelers for their goods (maybe a -2 on the scale) to the sadistic kidnapper who wears clothes made from the skin of his victims (-5).