This fanfic is VERY open for (almost demanding, needing) criticism. I'm going to make an attempt to make a non-Sue fanfiction with a self-insert.
Hard task, but I've got to try, fail, try, fail until I don't fail any more. Which is what I need your honesty for.
Chapters will be short, since that way more people might have time to read and give feedback.
So, here we go.

Darkness. Darkness and streetlights. A cold world with little compassion for what it has yet to befriend. A red creature, known as an echidna in the world he comes from and known as a freak where he is now, takes long, stalking steps as he makes his way through the broken darkness. Purple eyes reflect the void created from the almost empty streets. It might seem as if every object in that street is there merely to enhance the image and impression of emptiness; the exception that confirms the rule. Himself? Also a mere foreground object meaning to illustrate the aspect of emptiness called solitude. Abandoned? Or abandoning? What does it matter, when they both reach the same conclusion?
One of his wide shoes clash with a pebble, causing four taps to echo through the block; one when the shoe hits the pebble, one as the pebble bounces on the ground, another one when it hits a brick wall in an alley to his left ahead and the final one as it falls back to its frozen position, where it will be waiting until someone else does not mind his step and kicks it again. A low growl escapes the lips of the echidna, a growl of irritation and defiance. Irritation over his situation, his location and his yesterday; defiance towards the absurd suggestion of accepting it. Future. Chaos Control has two possible effects; travelling through space, time, or both. They travelled to another planet once before, but they handled. The people there did eventually accept them. But this time they have gone through a travel of time, to the future. The future without himself and his... allies. A simple deal of self-fulfilling, Tails called it. Them teleporting to somewhere else than their time and place led to the future not involving them. This is only one of the many parallel universes and possibilities, according said fox, meaning they can get back. And if they don't... well, then this will happen to the world. Robotnia... the new name for Mobius. Where all animals with intelligence matching that of humanity are to be extincted. Where he is now known as "Freak- 003" in the RSS-files. And where Sonic is of course going to be the hero again. He kicks another pebble. Six taps this time, six taps that play percussions to the music of silence in the city.