You see a lab assistant.
Notes
When it dies it will spawn either a Blue, Green or a Red Container.
They can be found during one of the tasks of The Cradle of Monsters Quest.
Abilities
Melee (0-400+)Damage Taken From Elements
Physical 
Death 
Holy 
Ice
Fire
Energy
Earth
Drown
Location
Behaviour
It follows you in melee distance.
Strategy
Lure them next to the Tube with the lower amount of points so you don't have to push the containers very far.