Duck "Bill" Platypus is a character that appears in the Sonic the Hedgehog comic series and its spin-offs published by Archie Comics. He was the alternate version of Duck "Bill" Platypus from Dark Mobius.
Bill's early history was most likely largely the same as his Mobius Prime counterpart's. The point of divergence was when Knuckles became corrupted by his chaos powers and decided to conquer Mobius. Eventually, Bill joined the countless heroes and villains alike that fell to Knuckles, now having assumed the mantle of Enerjak, and had his Core removed.