Harry Potter himself

Harry was skeptical if the spell he had found in the book worked. He could hypnotize anyone just by waving his wand and saying 'mindus dominimum'? How coms they didn't teach that spell in school? Lord knows he could have stopped Voldemort countless times with this spell...

Of course, maybe it didn't work as intended. If that were the case, Harry wondered why a book as old as Dumbledore, written by a reputable wizarding source, had it within it's pages.

Harry was too curious now, so he headed to the Great Hall. There were quite a few lovely ladies of Hogwarts in there.

Hermione Granger and Ginny Weasley were sitting together chatting.

Pavarti Patil and Lavender Brown appeared to be studying.

Luna Lovegood and Romilda Vane were testing new spells.

And Pansy Parkinson was trying to prank some first year Hufflepuffs.

As much as Harry wanted to try the spell on all the ladies, he didn't want to draw too much attention in case Dumbledore and especially Snape were watching. So he elected to get one test subject for now.