Which gaming mascot was originally created as a placeholder character during development but was so well-received that the company adopted it as their official brand ambassador?

In the competitive gaming industry, memorable mascots have become powerful brand ambassadors that transcend the games themselves. These iconic characters often evolve into cultural phenomena, driving merchandise sales, cross-media adaptations, and lasting player loyalty. How well do you know the history behind these virtual personalities that have shaped gaming brands?

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Kirby (Nintendo)
Crash Bandicoot (Naughty Dog/Sony)
Rayman (Ubisoft)
Creeper (Minecraft/Mojang)