Strange as it may seem to have the eponymous rodent ranked so low, it's perhaps a testament to the utility of Sonic's chums that the 'hog himself can only muster up fourth place.
On the plus side, he controls a damn sight better here than he does in Frontiers' DLC. Do you need a wall climbed to reach a fruit piece or medal? Trip is more than happy to oblige and at twice the speed. Need to reach a far-off platform by gliding? Straight-up flying with Tails will get the job done. The trouble is that he's majorly outclassed by every other character in the roster – anything he can do, another of the heroes can pull it off in a far more efficient manner. He's also capable of climbing any (vertical) wall, enabling him to reach treasures and secret routes that are just out of the way for the rest of the cast. All his usual abilities and trappings have made the migration to Sonic Superstars intact he can still glide effortlessly through the air, his gloved hands outstretched in a comical fashion that's sure to elicit some laughs. In literally any other side-scrolling Sonic game in which he appears, Knuckles would place near the top.