Here's my list:
Sonic: Will Friedle. (Bumblebee)
Dr. Eggman: Mike Pollock, Brian Drummond, or really anyone that can imitate Mike.
Tails: Colleen O'Shaughnessey.
Knuckles: Dan Green.
Amy Rose: Lisa Ortiz.
Metal Sonic: Ryan Drummond.
Espio: Matthew Mercer.
Charmy: Colleen O'Shaugnessey.
Vector: Keith Silverstein.
Mighty: Wayne Grayson.
Ray: Greg Cipes. (Beast Boy)
Big the Cat: Kyle Hebert.
Tikal: Jennifer Hale.
Gamma: David Sobolov. (ShockWave)
Rouge: Grey DeLisle. (Catwoman)
Shadow: Jim Cummings. (Steele from Balto)
Professor Gerald Robotnik: Mike Pollock.
Maria Robotnik: Stephanie Sheh.
Omega: Aaron LaPlante.
(Super) Neo Metal Sonic/Metal Madness/Metal Overlord: Ray Chase. (each progression has his voice get deeper, more guttural and more draconic in tone)
Abraham Tower: Roger Craig Smith.
Black Doom: Ben Diskin.
Emerl: Sonny Strait. (TOM 1)
Gemerl: Steve Blum. (TOM 6)
Silver: Pete Capella.
Blaze: Bella Hudson.
Mephiles: Robbie Daymond.
Eggman Nega: Mike Pollock.
Jet the Hawk: Clifford Chapin. (Katsuki Bakugo)
Wave: Bella Hudson.
Storm: Travis Willingham.