Maximillian Acorn is a character that appears in the Sonic the Hedgehog comic series and its spin-offs published by Archie Comics. He is the alternate counterpart of Mobius Prime's Maximillian Acorn and the father of Sally Acorn.
At some point in his life, Maximillian Acorn was freed from his prison in the Zone of Silence and managed to become member of the Mobian society one more. After Sonic the Hedgehog married Sally Acorn, Maximillian became as well a grandfather when Sally gave birth to Sonia and Manik Acorn, who he cared highly for. He was presumably killed when Mobotropolis was nuked by their universe's Dr. Eggman.