This article contains spoilers for Protocol Cy-Fox and the fate of a popular canon character in it.
Sonic the Hedgehog/Metal Sonic Mark V
Sonic the Hedgehog (3220-3237) was a Freedom Fighter on Mobius Prime and de facto leader of the organization in its fight against Dr. Ivo Robotnik and his Eggman Empire. He would later be captured, having his brain removed and used as an organic processor for Metal Sonic Mark V (3227-2116?), Eggman's chief enforcer. As Metal Sonic Mark V, he personally killed security and military personnel that were attempting to defend Space Station ARK in Robotnik's home timeline and notably had both Dr. Maria Robotnik and Lieutenant Miles "Tails" Prower in a kill-list.
Personally facing off against the fox, the hedgehog severely injured him but found himself countered by a sacrifice move that forced both out into open space. Little did Mark V know, the dead fox would later return as a heavily armed cyborg specifically designed to beat him/it.
Born Day 174, year 3220 on Mobius