This is the negative/mind controlled version of Sonic.exe named Sonic.GEN/Infectior by
MegaDorin for his game Sonic.gen Misery Beginning. He is a demon-Highest hybrid that came into being after being created in a 60-year war between demons and Highests, and 15 years after that war ended he took the form of Sonic the Hedgehog and started another massacre, this time on EXEs and their slaves.
Credit to
Lucaria-Rukario,
WarchieUnited,
SuperGoku809,
RetroKrasher,
Chris-The-Wildcat,
facundogomez, and anyone else I forgot.
Sonic (C) SEGA and Sonic Team
Sonic.exe (C)
ASTRANOMICONXSonic.gen (C)
MegaDorin