I agree with Neranz Laverani about the balance problems (ie that if they were weak enough to be killed, they should also be too weak to possess their killer), however it is an interesting concept and would work particularly well for a Wraith class in a World of Darkness mud.
I had actually thought of doing something similar for my old mud, for diablerie (when one vampire drains another vampire completely dry, then sucks out their soul) - thus the absorbed soul fragments of the victim could try and force the killer into performing certain actions. This wouldn't really be possession - the killer had intentionally consumed the soul of their victim to gain some of their power - but the results could work in a similar fashion. It would help provide some discouragement for those wishing to take the quick route to power.
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