(Top) Shadow + Sonic= Surge the Hedgehog!
(Left) Sonic + Silver = Shimmer the Hedgehog!
(Right) Silver + Shadow = Salvatus the Hedgehog!

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Did this as a bit of a design exercise of sorts. Was going to do a proper hexafusion meme, but I got too lazy to think of a tri-fusion design lol. I may do that later on, but for now enjoy these simple mashups!