Diable is a villain from KiraKira☆Pretty Cure A La Mode. It is a demonic dog-like spirit who wants Kirakiraru to regain its true form.

Ichika Usami is a second-year middle school student who loves sweets, but struggles to bake. One day, she encounters a fairy named Pekorin, who is able to detect "Kirakiraru", an element residing in sweets. However, an evil fairy starts to steal the Kirakiraru for themselves, leaving the sweets black and lifeless. Determined to protect the sweets, Ichika gains the power of the Legendary Patisserie and transforms into the Pretty Cure, Cure Whip, to protect the Kirakiraru.
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(Source: Wikipedia, edited)

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