Super Sonic is Sonic transformed by using the 7 Chaos Emeralds.
He cannot take damage under normal means and can reach an impressive speed. As Sonic's body can't handle his super form on its own, he needs rings to maintain it ,so his rings slowly burn away over time (usually one per second)and Sonic needs to keep finding rings to stay in this form for as long as he can.
In M.U.G.E.N, Super Sonic has been made by several creators. He is also a pallete for ABAB's Sonic.
This version of Super Sonic uses edited sprites from Sonic the Hedgehog 2. Its soundpack consists of high-pitched squeaks and grunts and has a unique variety of moves, including a Shun Goku Satsu. There is an edit of him where Tails follows him,but it is offline.
This character is an edit of Claymizer's Sonic, recoloured to look like Super Sonic. It's basically a palette swap, as only his standing sprite resembles Super Sonic and every other animation is a yellow-colored Sonic.