Glitch
This isn't a cheat but when you are at the batcave (where you can change suits) make sure to have Robin's DECOY move with his Tech suit. Then press O and switch to that Robin. (this also works for NightWing) Move away from the real Robin and for you to die and BAM you have a new Robin. (I did this and got over five Robins lets see if you can get more)
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