Well, it's possible.... but i think that Cloud and sephiroth should be the power rangers in ...
Power Ranges: FFForce!!!
It's morphin time!
Red ranger=Cloud
Blue ranger= cid
Black ranger= Barret
Yellow ranger= Yuffie
Pink= Aeris
Green= Sephiroth

Go go power rangers u mighty morphin power rangers!

Then tommy comes in and kicks all of their asses, except seph, and the two join forces. Yeah my imingation!!!