Play As Eddie Gordo:
After completing story mode with Christie, Select her again with the Triangle button. 

Play as Miharu:
Defeat story mode with Xiaoyu, then Select her again with the Circle button to play as her schoolgirl buddy Miharu. 

Play as Panda:
Choose Kuma with the Circle or Triangle button to play as Xiaoyu's pet Panda. 

Play as Schoolgirl Xiaoyu:
Defeat story mode with Xiaoyu, then Select her again with the Triangle button to play in her academy uniform. 

Play as Violet:
Select Lee with the Circle button to play as his alter-ego Violet. 

Unlock Dojo Stage:
Conquer all four Tekken Force stages to unlock the Dojo level. 

Unlock Theatre Mode:
Beat story mode once with any character.