Vargouille Guard or Knight
Tiny fiend, chaotic evil 
Armor Class 13 (chain helmet) 14 (plate helmet)
Hit Points 13 (3d4 + 6)
Speed 
      5ft
        Fly: 40ft
          
 
  Damage Resistances Cold, fire, lightning
  Damage Immunities Poison
  Condition Immunities Poisoned
  Senses Dark vision 60ft., passive perception 8
  Languages Understands Abysmal, Infernal, and any languages it knew before becoming a vargouille but can't speak.
 
  Challenge 1
  Actions
  Bite. Melee Weapon Attack: +4 to hit, reach 5 feet., one target. Hit: 5 (186 + 2) piercing damage plus 10 (3d6) poison damage.
 
Kiss.
 
 
  Vargouille with different helmets.