We have a full battle with Kazumi from Tekken 7. The battle shows both human and demon as. The difficulty is o easy so it is hard to range on how hard both are. In terms style she resemble Heihachi with a few moves difference. You can see the full fight below so you can gauge for yourself is the origin of the demon power is as dangerous as her son and grandson.
Article:http://attackofthefanboy.com/videos/kazumi-boss-fight-gameplay-tekken-7/
As always thank you for reading.
