Mineta

"Midoriya?" Mineta asked, coming down the hall. Even as an adult he was still on the short side. Years of training had resulted in him gaining a bit of muscle, but that was about the only real distinction. "That is you, right?" he asked.

"Uh, yeah..." Deku said, rubbing the back of her neck. "I might have had a run in with a weird quirk or something."

"This is amazing!" Mineta said, running over. He looked the recently changed girl over, his eyes wide and... hungry. It made her feel incredibly uncomfortable, which was saying something when Mineta made her uncomfortable sometimes even before she became a girl. "You gotta let me check out your body!"

"I don't think I'm gonna do that," Deku said. "I need to find a teacher and get some help with this, so..."

"Wait!" Mineta said, looking around. "I... I've heard about things like this before. Bodies changing suddenly with no known cause."

Deku raised an eyebrow. "You have?"

Mineta nodded quickly. Maybe a little too quickly. "I made some notes, have them back in my room. We can go and get them and you can look them over, see if they apply. Or... I know where a teacher is. I saw Midnight a little while ago. I can bring you to her, but I doubt she has much experience with things like this."

Rubbing her chin, Deku considered. Mineta was creepy, but he wasn't evil. If he said he had something he probably did. The question was what and what he'd try to get for it. The alternative was Midnight, who... wasn't at the top of the list for people Deku would seek out for help, but she was a teacher.