Mr. Voiceless

Mr. Voiceless is the main antagonist of Galaxy 6, and then is seen in every Galaxy afterwards, where is confirmed to be a humanoid manifestation of the Fourth Galaxy, and the form it uses to converse with other species.

Galaxy 6
Originally appearing as the silent bodyguard of Mr. Bissell and Mother Wynne, Mr. Voiceless has always been the driving force behind Star Corp. When he is defeated, it is revealed that he isn't actually an alien of the Third Galaxy, but of an entirely new species, altogether.

Galaxy 7
Mr. Voiceless makes many appearances, contacting Earth in an attempt to reclaim organs that are being kept there. He is also seen on the Menagerie's base on Meridian, where he is defeated.

Galaxy 8
Mr. Voiceless is present on the Third Galaxy's planet where the Leader is being detained. He is revealed to be controlling him, much like what happened with Star Corp. Dimitri and Sasha defeat Mr. Voiceless in an intense battle.