Paramedic

You will encounter Paramedics within both the Mission battles (once you reach level 45) as well as the story line maps once you reach the Black Legion Checkpoint.

Paramedics provide in-battle health to other humanoid enemies (not turrets) currently on the screen at the rate of 60 health points for every 1.5 seconds.

They don't have a long distance attack, and are content to just stay behind their shields healing other enemies. Only after all other enemies on the screen are killed will they attempt a melee attack.