For the first one, a fictive is an introject of a fictional character while a factive is one of a real person. There are also sort of in-between areas like fogtives or fuzztives that are sort of both, and as for MCYT introjects that’s something you see a lot when it comes to ‘this is a real person but also they’re in character’. Also, reminder to not treat those fictives like their source unless it is specifically specified that that’s okay.