Best Role Ideas?

[TDC]

As for the DNA cop, how about md5-hashing (with a seed obviously) the player name and returning that, the DNA cop can then compare the hashes himself..

N1: PlayerX (Dead Body) was murdered by someone with the DNA signature 1a8f43915f2748d3e639439793205d21.
N2: You checked PlayerZ, he has DNA signature 17f5b7e447dfca3b832f5b2411b76538

and so on (this was produced by hashing "123<PlayerName>" where the murderer was PlayerY..)

Although you can also just assign random 10 character strings before the game starts to each player or whatever.