I think Bleach and FF are the only colab REMs we (NA) have with 6* golds. Maybe shinra bansho as well but meh.
That said, Raoh can definitely hold pull more weight than many of FF's 5*s, definitely. Objectively better active than Squall aside.
I think this is reflected in the MP values, where Cloud is 6000, Raoh is 5000, and FF 5*s are 4000.