Sonic.exe

The First Timeline
Sonic.exe appears in the newest reboot, Killing Sonic and making him lose ONE life. He also finds friends "unnecessary" if we are to take Sonic.exe's cheap insult about Sonic's friends being killed seriously.

Later on in the series, Sonic and Sonic.exe "team up" to defeat Eggman, But Sonic disappears and is replaced with Metal Sonic, Who Sonic.exe must defeat with Meow and Niniel. Sonic.exe goes on a life-changing journey to defeat Eggman and Metal Sonic, Involving finding their ship which blows up, And even seemingly almost finding their hideout.

The -1st Timeline
Way before the reboot, a Sonic.exe was attempted, This incarnation looked blueish in color, And had the features of a Sonic Adventure rendition of Sonic, but also slightly cat-like. This version was instantly killed by Unknown, Only for the rebooted universe to bring a new incarnation of him in.

Sandbox: Sonic.exe ripoff bootleg
Sonic.exe appears with Tails Doll in the bootleg, also with Sally.exe, Sonic.exe goes on a journey to kill Meestery for ruining his world, Tails Doll assists him with this.