So basically you can fight any character from any type of fictional story or whatever it's up to you 

You can fight 9 characters who are given some information about you but you have all of your knowledge on them 

Your either on a similar tier or higher 

You can choose any power you might have chosen or your using a OC who already has said powers 

Your immune to plot armor story manipulation or anything that can mess with the plot itself and most types of reality wrapping