1) 72 gold revenge medals nets you 100% but there is a DLC part in the stats and getting the other 6 nets you 100% in those stats...
2) If you have completed the Mystery Stalker sidequest then you can't see the character and you will be able to do it in NG+
3) As I understand it not one Riddler trophy unlocks certain things, it can be random or based on what you do...
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