Inspired by the Glitch Tech Episode: Find the Glitch
(Your OC), (My OC), (Your Crush), (My Crush), (Your Best Friend), and (My Best Friend) all get sent to a simulation room on the school grounds. Aizawa insists they're trying a new training exercise called 'Find The Villain'
"In front of you six are envelopes, Two of them have the word 'Villain' on them. It's your job to find the Villain and pick them out"
Then Aizawa leaves and everyone is locked in the room
After the game goes on for a round and no one comes in to get them, they begin to think if this was Aizawa's code that may be two of them were actually villains and they needed to figure out who they are.
And looking back on their time at UA, it seems to Add up that (Your OC) and (My OC) are the Likely Culprits.
(This can be an Actual situation or just the outcome of them being inside for so long)
(With Glitch Techs being only 2 seasons, they never confirmed nor denied whether the person they decided was actually the Glitch or not because Hinobi had already caught the Glitch outside the room. So the outcome can really be up to us)