No, all Sonic characters are fictional, and don't exist in real life.
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Yes, they exist the Sonic and Shadow the Hedgehog video games. However, they are not real in real life, of course!
No Net Kritterz does not exist in real life.
Currently, there is not.
Redstone does not exist in real life, however it's traits and behavior closely resemble those of electricity being transmitted through wires.
It's called Elemental Hero Clay Guardian and no it doesn't exist in real life