I hope Raidou will be revamped. Two options :
1. Since it appears there are many of them (robots), maybe it could be a Mokujin-like fighter with its own BB, BH, FS, FR, taunts and maybe his unique throws. An improved random dice.
2. Mix of ninjas-only moves and new tricks.
What if a non ninja got cloned? Maybe the real Lisa is dead and a clone was made, Dr. Hamilton, as a different version of her lucha libre with flashy choregraphies and lasers ? Could be a final boss and an interesting take on a darker La Mariposa.