A quick picture I drew...

This is a Sonic AU where Sonic the Hedgehog is stillborn and never existed.
Eggman took over Mobius and converted a whole planet into a mechanical futuristic utopia.

As years passed, Mobius is destroyed by the ARK Cannon, but Eggman's decendants (as well as Shadow the Hedgehog) still survived because of the Master Emerald's power. They decided to use it to create a new planet similar to Mobius, naming it New Mobius.

The Robotnik family continued to descend in their new home planet until then; when a Mobian called Marina the hedgehog (Shadow's wife) died after giving birth to a blue hoglet with two heads, Shadow was depressed and decided to not only rid himself of it, but leave it in Christmas Island to fend for itself.

Luckily, the conjoined twin brothers managed to survive infancy because of the juice of a coconut that rests in a cardboard box they were placed in. Naming each other "Sora" and "Nicky", they cared for each other in a comfortable way, learning how to walk and forming a close bond.

Sora and Nicky reached 14 years of age after having individual personalities. They left Christmas Island and began to explore the rest of New Mobius, searching for a Master Emerald which is left in a temple for many years.

Here, Sora is comforting Nicky (who had a bent ear which makes him sad) during winter in the city.

Sonic the Hedgehog © Sega and Sonic Team