Cameo Fantasy III

If I understand your intentions, you want to do a tribute to JRPGS. If so, why did you leave Persona 4, Mario RPGS, Lufia, and Earthbound to such minor roles? You have 2 characters from Dissigea playable. Mr. Saturn for Ghosts? It could work. Why are you fighting Ness anyways? Is he possesed? Also what do you have for Espers? You could Represent any left over games using those.
Esper Suggestions:
The Dark Dragon (Mother 3): A good replacement for Crusader. His abilities were sealed away by the needles in Mother 3. In the games ending, it used an attack which assimilated the whole world. No one lived except Lucas, Porky, Kumatora, Duster, Flint, Claus, and Boney.
Various Personas OF THE CHARACTERS IN YOUR HACK! (Persona series/Various Series): It is said to be the characters inner strength. You could use it to complete your characters development.
Legendary Pokemon (Pokemon): They are Pokemon, and they are Legendary.
Geno (Mario RPG): GENO WHIRL!
GILGAMESH (FINAL FANTASY V): If you keep any summon, make it Gilgamesh.
Buriki Daioh (Live A Live): A Giant Freaking Mech. Make it happen.