"Hidden" NPC's in Garry's Mod

NPCs Available Through Console
Advisor (npc_advisor, "models/advisor.mdl")
Crab Synth (monster_generic, "models/synth.mdl")
Mortar Synth (cycler, "models/mortarsynth.mdl")
Ichthyosaur (npc_ichthyosaur)
Overwatch Sniper (npc_sniper)
Combine Vent Turret (npc_turret_ground, not spawnable, as it needs a brush to work properly)
Advisor Pod (cycler, "models/advisorpod.mdl")
Boid (monster_flyer)
Leech (monster_leech, it's model is overridden with the Half-Life 2 model, so it doesn't work properly)
Ichthyosaur (monster_ichthyosaur)
Brown Boid (monster_flyer, "models/aflock.mdl")
Flocking Floater (monster_bloater)
Government Man (monster_gman)
Sitting Scientist (monster_sitting_scientist)
APC Driver (npc_apcdriver)

I had no idea any of these existed, and I thought I knew everything about this game by now