While impressive from an artistic standpoint, these are essentially costumes on a skeleton. The gameplay mechanics, physics, and move sets remain strictly those of Tekken 6 .
If you have downloaded a Tekken-8-PPSSPP-Zip file from community sources like JV Sensei or Cuma Hape , follow these general steps to set it up: YouTube·Anas Plays Tekken 8 NextGen PPSSPP Tutorial | New Textures, & Stages Tekken-8-PPSSPP-Zip