Starro is a Star Conqueror. These nomadic and parasitic creatures roam the cosmos in two forms: motherstars and parasites. Motherstars are sentient, while parasites are extensions of the motherstar's consciousness. A parasite attaches itself to other sentient creatures, allowing the motherstar to control that creature's mind. Once controlled, the victims work toward growing more motherstars to go out and bring universal harmony to other planets-by conquering them. Little did the Star Conqueror who came to be known as Starro know how difficult carrying that plan out on Earth would be! Starro has little concern for what happens to the individuals it controls. They're a tiny part of the whole. When Starro speaks to creatures it doesn't control, it does so telepathically, urging them to join in universal harmony.We've got some pics and a video below to finish out Starro's reveal.
[Source: Turbine press release]