pking should not be total kill everyone there should be a reason for doing so.

Its like robbing banks, they do it because of the money. Naturally PKing is to kill and loot. Personally im not going to play a online rpg that is all \"happy happy joy joy\" and rainbows and flowers...

You should get a list of people that have killed you and you should be a allowed to kill them.

Im referring to UO system here. Killing someone turns you into a murderer (red, pk or whatever) which means you are free \"meat\" to anyone. That means that anyone can attack you/kill you without them turning into a criminal/murderer them selfs.

Also \"guards\" will attack/kill any murderers within \"guard zone\" just by yelling \"guards!\" if you see one that is...

To turn back into a non-murderer (blue) you had to wait sometime (time * kills) without killing anyone. Some sort of a \"murder counter\".

I cant remember if UO had any system where \"NPC reds\" wouldnt attack them but i think there should be \"hostile cities\" where only red can run around without getting attacked. Im referring to cities without guards but cities where only reds are able to freely \"explore\".

you should also be allowed to kill people who steal from you if you notice who it was or people who commit other such crimes against you.

Of course, like in UO, failed attempt to steal from someone will mark them as criminal (grey) and by yelling guards they will get killed. That is IF they are within guard zone.
I remember that being criminal also means that you are pretty much \"free meat\" at least towards the one the crime was done to.

You should also definatly be allowed to loot their body.

Yep.

Though i hated (in UO) people that steal your loot from your monster that you killed. Though there was some system that \"flagged\" anyone as criminal if they looted stuff from creature you killed, which i think is the way it should be. Though even that isnt completely problem free...

The game should be as free as possible. Both ways (evil or good) should be viable paths, both with its pro\'s and con\'s.