Which SEGA character design was originally created as a potential mascot before being replaced by Sonic the Hedgehog?

SEGA's iconic blue speedster has become one of gaming's most recognizable mascots since his debut in 1991. Created as a direct competitor to Nintendo's Mario, Sonic the Hedgehog revolutionized platform gaming with his emphasis on speed. This trivia question explores the fascinating origin story behind one of gaming's most enduring characters and how SEGA developed their brand mascot to challenge Nintendo's dominance in the console market.

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An armadillo named Mighty
A rabbit that could grab enemies with extendable ears
A wolf character that transformed into different forms
A human boy with rocket shoes