Which gaming brand mascot was originally created as a placeholder graphic during development but became so popular that the company kept it as their official representative?

Brand mascots in the gaming industry have become iconic symbols that players recognize worldwide. These virtual characters often transcend their original games to become cultural phenomena, representing entire companies and franchises. Test your knowledge about some of the most influential gaming brand mascots that have shaped marketing strategies and built unprecedented brand loyalty in the interactive entertainment space.

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Kirby (Nintendo)
Sonic the Hedgehog (SEGA)
Pikachu (Pokémon/Nintendo)
Vault Boy (Fallout/Bethesda)