Damage caused by drones:

Preator II, Infiltrator II, Acrolyte II - 48, 24, 15 EM
Org II, Hammerhead II, Hobgoblin II - 48, 24, 15 Thermal
Wasp II, Vesper II, Hornet II - 48, 24, 15 Kinetic
Berserker II, Valkyrie II, Warrior II - 48, 24 Explosive

Damage types caused by NPC's:

Guristas - Kinetic / Thermal
Serpentis - Thermal / Kinetic
Blood Raider - Thermal / EM
Sansha's Nation - EM / Thermal
Angel Cartel - Kinetic / Explosive
Minmatar Fleet - Thermal / Explosive
Amarr Navy - EM / Thermal
Caldari Navy - Kinetic / Thermal
Gallente - Kinetic / Thermal
Mercenary - Thermal / Kinetic (little EM/Exp)
Mordu's Legion - Kin/Thermal
Drones - EM / Thermal
Khanid - EM / Thermal
Thukker - Explosive

Best Damage to use against NPC's:

Guristas - Kinetic
Serpentis - Thermal & Kinetic
Mordus - Thermal & Kinetic
Blood - EM
Sansha - Thermal
Angel - Explosive
Mercenary - Thermal
Arch Angels - Kinetic/Thermal