Thought this would be an interesting topic to make a thread for. They haven't touched on the traitor stuff lately in the series with everything going on with the new group of villains appearing, but wondering who the traitor is in UA I think is one of the more interesting sub-plots.
Obviously the traitor is someone that had to have been at the training camp, right? So it has to be one of the teachers there or one of the students in Class A or B. Right now it seems like a lot of the popular choices online have Mashirao Ojiro or Denki Kaminari being the traitor. Also if it is someone from Class B I think that Momoma might be an interesting option. He is one of the few Class B students that has gotten some focus, and his copying power would be very useful for someone who is trying to hide themselves being a traitor.