It's that creature again! The same one I saw on my island.
He was voiced by Edwyn Tiong, better known as Omahdon, who has also voiced other villains like Reaper from Overwatch in other fan animations. Nazo is a being of pure negative energy, created from all the times planet Earth drew on negativity from the Chaos Emeralds (such as through the Death Egg, Chaos, the Biolizard and the Black Arms), taking form once there was too much for the emeralds to contain. Nazo is the main antagonist of Sonic: The Power of Nazo and its remake Sonic: Nazo Unleashed (Parts 1-3, and the remaster Sonic: Nazo Unleashed DX), as well as the official sequel Sonic: The Wrath of Nazo, all created by Chakra-X, plus the non-official sequel Sonic: The Return of Nazo made by SolarFoxProductions. Everyone and everything you know is now coming to an end.
With the seven Chaos Emeralds and the Master Emerald, I will go beyond the strength of a god! Perfect Chaos is nothing compared to me! Sonic, Shadow. You're too late, Sonic! I have all the emeralds and the altar! With these elements I will annihilate this planet! I am pure Chaos! Every time this pathetic planet has drawn on negativity of the emeralds, I began to form, until it was too much for the emeralds to suppress.