I have said it once, and i'll say it again, Tobin's spirit guid has been made, West End for the GBI role playing game it ran on the D6 system and yes i do have a copy and yes the name is now copy writed, so no you cant publish one without the consent of the bankrupt game company west end. It has details on over 200 ghosts, including ones badder than Gozer it's self. it is a very cool guid, i suggest you should pick it up but it's hard to find.
oh and the d20 system is the weizards of the coast's role playing system invented by TSR to entertain geeks and to bring to life the fantasy world, other systems include by do not limit: D6, WhiteWolf, BESM, LOTR unit, and gurps.