She has a tiger. This is Kazumi Mishima, Heihachi Mishima's wife who'd only previously been mentioned in passing but is now the final boss in Tekken 7, complete with that cat and access to devil-gene powers.
Here's how that all plays:
Her devil-gene ability is triggered when she's defeated in a round and looks like this:
Image credit: Fighters Generation
You can also see how the devil version of Kazumi plays towards the end of this video of the arcade version:
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