NPC Damage types, and (damage weaknesses):

Guristas - Kinetic / Thermal (weak against kinetic)
Serpentis - Thermal / Kinetic (weak against thermal)
Blood Raider - Thermal / EM (weak against EM)
Sansha's Nation - EM / Thermal (weak against EM)
Angel Cartel - Kinetic / Explosive / Thermal (weak against
explosive)
Mordus Legion - Thermal / Kinetic
Minmatar Fleet - Thermal / Explosive
Amarr Navy - EM / Thermal
Gallente Navy - Explosive
Thukker Tribe - Thermal / Explosive