BNHA theory
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I was talking about BNHA with a friend in discord, and I wonder, what if the UA traitor is Hagakure? 

How did she pass the entrance exam? She is literally invisible, it is theorized that she simply turned off the robots to defeat them, but how did she know where the buttons are?

My guess is that there have always been spies at UA, and when one graduates, another applies and enters UA, so the previous spy would have found out what next year's entrance exam would be and how to defeat them, and then would later go to AFO and tell them about it so the next candidate would know just how to beat the robots, or to just simply turn them off and actually know how

Also, they knew that Azawa would be their teacher, so having a quirk that can't be erased by him would be very useful, such as Hagakure's quirk 

Not to mention, with her being invisible, she could go anywhere w/o anyone knowing  about it, including spying on the staff

We also don't know much about her past, what her parents were like or what school she went to, she is probably going to get more development in the future, but we don't know which makes anything possible. 

And who knows? She might be hiding part of her quirk that would help her in getting info to and from AFO (or AFO could be using one of his quirks for that, idk) because she is a mole.

This is just my theory on the UA traitor, I could be wrong, I could be right.