I will start, while the effects of the "baubillious " spell are unknown they produce white sparks. Maybe it can be like the expelliarmus spell but changed from red to white and it damages instead of knocking objects from the targets hands.Also they could add "cave inimicum" which would be like the protego spell but invisible and instead of holding you can toggle it on and off. And my last idea is buckbeak. If you have any ideas put them in the discussion.

EDIT: I also feel like having generic hogwarts students would be a good idea. Theere would be 16 in total, for example "Ravenclaw white female" "Ravenclaw white male" "Ravenclaw black female" "Ravenclaw black male" and if it isn't to much work they could each have skins that change hair color, liek black hair,white hair(like dracos) red hair and brown hair.