Which gaming mascot was originally created as a placeholder character during development but was kept after developers fell in love with the design?

Test your knowledge about the iconic mascots that have become the face of major gaming brands! These characters have evolved from simple pixel art to complex 3D models, starring in countless games and marketing campaigns. They've shaped gaming culture, appeared on merchandise, and even crossed over into other media. How well do you know the stories behind these famous gaming ambassadors?

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Kirby (Nintendo) - originally called 'Popopo' and was a simple placeholder before becoming the pink puffball we know today
Crash Bandicoot (Sony) - initially designed as a temporary character model before becoming PlayStation's unofficial mascot
Master Chief (Xbox) - first created as a stand-in model during Halo's early development before becoming Xbox's flagship character
Sonic the Hedgehog (Sega) - started as a basic sprite placeholder before being developed into Sega's answer to Mario