Useful NPC stuff:

** Damage types ***
Guristas - Kinetic / Thermal
Serpentis - Thermal / Kinetic
Blood Raider - Thermal / EM
Sansha's Nation - EM / Thermal
Angel Cartel - Kinetic / Explosive / Thermal
Minmatar Fleet - Thermal / Explosive
Amarr Navy - EM / Thermal

amarr - Thermal and EM
Most Damage to Amarr - Thermal

Angel Cartel - they do all types of damage to you
Most Damage: Explosive damage

Blood Raiders - EM and Thermal to you
Most Damage to Blood Raiders - EM

Gallente - Thermal, EM and Kinetic
Most Damage to Gallente - Thermal

Gurristas - they do kinetic and thermal damage to you
Most Damage to Gurristas - Kinetic

ECM

green == Gallente
Blue == caldari
Red == minmatar
Yellow == amarr