That’s Mr. Meeseeks.

Meeseeks are a powder-blue-skinned species of humanoids (each of whom is named "Mr. Meeseeks") who are created to serve a single purpose which they will go to any length to fulfill. Each brought to life by a "Meeseeks Box", they typically live for no more than a few hours in a constant state of pain, vanishing upon completing their assigned task so as to end their own existence and thereby end their suffering; as such, the longer an individual Meeseeks remains alive, the more insane and unhinged they become.