Specifically, this is the appearance of Kyubi for the Shadowside series, 30 years after the original series.
In his Shadowside form, Kyubi appears similar to a more feral, quadrupedal version of his appearance in the present series.
His paws and the tips of his nine tails are now purple and magenta in color.
In his Lightside form, Kyubi appears more humanoid, with a mane of yellow hair with red streaks, and wearing a purple kimono with a red obi.
His tails stick out from beneath it, resembling classic depictions of kitsune disguised as humans.
Kyubi is a supporting Yo-kai in Yo-kai Watch Shadowside: The Return of the Oni King.
Yo-kai Watch Shadowside animation series
In SS017 during the events of the fox Yo-kai scaring students case, Kyubi was summoned in his Lightside form by Natsume to understand the situation. When Inari attacks the team, Kyubi was summoned in his Shadowside form asking the later to stop, causing Inari to stop her attack and change to her Lightside form upon seeing her fellow fox Yo-kai. Kyubi then listens and understands Inari's reasoning of her actions.