Delmi Robins!
Delmi showed up with a pair of glasses on her face and the famous lightning bolt drawn on her forehead, with her hair swept up beneath a messy black wig. She wore her own school robes, and toted her own broomstick around, but there was a piece of paper taped over the name of her broom model and "FIREBOLT" written across it. It was pretty obvious who she was dressed as.
Per the mods, the Carrows saw her and sent her back to the dormitory to change, but feel free to have your char see her!