take Galiene back to the ghost ship and let her get possessed again. As for the fisherman, use the tablet you got from mordred (the guy who let you fuse items). For the Demoness, i think you gotta let her play with you, as for the ghost, let her use your body. Of all the characters in this game, the ghost (Nel) is the real MVP. She can powerlevel you AND Evie. After a while, you can tell her where to go when she power levels you.