[quote=@TheUnknowable]
[@Oraculum]in most sci fi, blue weapons are the good guys, green neutral, and red bad.  That's true in star trek and star wars.
[/quote]

Which is more or less the cosmetic factor I mentioned. Note that the colour of the lasers does not tendentially alter how effective they are; the distinction is there purely for identification purposes, or to occasionally serve as a plot point - which I understand is how it would work in this role-play.