Great thread idea, let me just jump into this haunted house fiasco.
Prince Elias: Believes in Jinn and isn't scared of them so, he will probably seek the help of God and find a logical way out.
Merrick the Jester: As his name suggests, he would be terrified beyond belief at the concept and most likely cling tightly to Elias while using his fire magic as a guide.
Sir Charles: No fear at all but he would use it as an opportunity to teach the Jinn ghosts a spiritual and moral lesson.
Maya: Terrified but putting on a brave face trying to stay brave for her little brother Alden.
Alden: Will actively try and fight the Jinn and challenge them to possess him, also will break a lot of things.
King of Roo, some of the cast. Not released yet, but soon it will be.