Iconic Sonic characters like Amy Rose, Tails, Knuckles & Dr. Eggman will cameo in Lego Dimension’s Sonic’s Level Pack & Adventure World Content. Confirmed from TSSZ News writer SSF1991, he stated this after looking through tweets made by BlueParadox on Twitter.
Source: TSSZ News
If you thought Sonic was the only character from his world that would make an appearance in LEGO Dimensions, then you thought wrong. It was confirmed at Gamescom that Amy Rose, Tails, Eggman, and Knuckles will all be a part of the Sonic pack in LEGO Dimensions as NPCs.
BREAKING: Amy, Tails & Dr. Eggman are going to be included in Sonic's Pack in #LEGODimensions. They won't be playable. More info soon.
— Parax ⍟ (@BlueParax) August 19, 2016