Mike Nelson, Destroyer of Worlds: Planet number 2 for Mike, as him ordering the Nanites to make a distraction in an attempt to help Pearl and Prof. Bobo, and later asking the Nanites to stop the Observers from preventing their escape, results in the destruction of the Observers' home planet. Also the Trope Namer:
Mike: I just asked them to take care of a little problem! Crow: And they did! Here comes Mike, Destroyer of Worlds! Servo: Oh, god of fire and vengeance — get away from me, you knob!