Also forgot to add, but if Ochako really is the traitor I would expect a obvious connection to the Broker.
I agree with
@ShenGao on this, I´ve been saying this for a while, but whoever is the traitor should´ve some sort of connection with either AFO himself or his closest partners (Doctor and Broker) and this is because AFO would never pick up just anybody to do the traitor work, he´d need someone with a useful quirk for spying (like invisible girl), or relaying the intel (Kaminari), or someone who can cope with a Jack of All Trades quirk (like Monoma), the rest of the heroes are just not nearly as good traitor material as this 3, quirk utility wise, like what can Ochako do in favor of the villains with her quirk in all honesty?
Also the Toga and Ochako interactions should be taken at face value until another villain as a say on the matter, consideering the traitor theory and all, Dabi and Todoroki interactions are also hyped up but we dont know much about Dabi for the time being.
And honestly I´d have a easier time believing Kaminari to be related to the Broker or Monoma with AFO, rather than Ochako being the traitor for the time being because of the utility purposes, but I guess we will eventually figure out who the traitor is anyway.
Nicely written, you bring up man good points actually if you go through the classic checklist of mole behavior then uraraka fits the criteria almost to a t :near the middle of the pack performance wise, lives alone, has money troubles, has a solid-strong connection to main character(s) which is why I cannot see her actually see her being the traitor the twist in this manga are too good. The contrast between her and bakugo are very strong evidence...of her switching sides but her being the mole I find it doubtful. To me eraserhead is more likel,y he is in a position to get information that the villains could use, he has been directly involved in every incident receiving wounds every time but the villains failing each time to end him, other than allmight he is the first adult to see something in deku giving him the emotional bond for most of the class not just deku, tsyu, ieda, and bakugo. Skigarmki actually touched him and he just lost a bit of skin Nomu stopped right before killing him, with the extent of the damage most would rule him out, but him dodging the bullet so many time just highlights him for me also if you examine what is said about him in the intro it sounds very much like stain so him working to tear down the system seems to fit. He also is in a position to take someone with him when he goes after what I expect to come to a head with the death/near death of allmight Uraraka being manipulated into a situation she couldn't get out of easily seems a lot more in accordance with her character and something that toga would enjoy doing to her. But darn it I was just enjoying the story and then you have to throw this out for our brains to bounce around.
Eraser is more of a Kakashi like character though and honestly he isnt good traitor material, he gave Deku support for his actions, the traitor should never do that, either act neutral about the whole thing and dont throw any points about Deku´s quirk (a thing tsuyu did which is why I think she isnt the traitor) and the reason shigaraki didnt kill him is because his quirk is good, like what motivation would eraser have to be a villain after working his ass up to go up in the hero ladder with his quirk? This is why I´m not very fond, the teacher "X" is a traitor, because it doesnt add up, being a hero teacher means more income to the respective hero, so the money issue isnt a good factor for the betrayal of the heroes in the sidelines
(unless we are talking about someone like Mt. Lady with her debts I guess in that case we could have good traitor material if AFO offered to pay off some hugeeee! Debts).
This reason can apply to some of the students very well but the ones like Momo and Todo or the ones we already know by common sense that arent the traitor.
Of course aside from the income thing, there could be other reasons behind the traitor´s actions, which would be either, family member "X" is being imprisoned by AFO´s goons at a unknown and therefore the student is forced to comply, this could also apply to one of the teachers but again I find this unlikely because the teachers are better informed in the hero world and would probably be able to fix most of these sorts of cases unless AFO is very physically and directly involved, which shouldnt be the case consideering his health issues, but this could be a good motivation for one of the students turning traitor.
3rd reason could be like a Grant Ward (from Agents of Shield) scenario, the traitor was originally quirkless or/and living in poverty and was offered a quirk by AFO and a chance to go up in the social ladder, I dont have any idea which one of the students could fit this bill, many were believing Kirishima could´ve been like this for a while, but now that we know it wasnt the case and he just dyed his hair we have no easy to pinpoint suspects and invisible girl would just be too obvious.
4th reason the traitor has family ties to AFO´s villain partners or AFO himself, which I particularly find possible for Kaminari and Monoma.