Harry Potter wasn't exactly sure what to make of Hermione Granger, he knew that she was in his year...but other than that he didn't know too much about her. She seemed to make it her goal to be as unnoticeable as possible, she rarely spoke up in class, and when she did it was always a surprise to everyone around her. She also surprisingly short for her age, heck she was even shorter than him, which was a bit of a surprise considering that she was a full year older than him. You could spot her in the library from time to time, reading some book she would occasionally pull out and read.
The twins had taken a liking to pranking her, by either filling her hat with confetti, turning her hair blue, or doing anything that would annoy her. It was her reactions that the twins were looking for, but when they were in public Hermione wouldn't really react in a meaningful way. When they were in private...that was a different story altogether. Harry had once stumbled into the common room when Fred and George had played one of their pranks on Hermione, which had given him a front row seat to see what she was really like.
"Run Fred!" George had laughed as he and Fred raced passed by Harry, "She's almost gotten to us!"
"ARRGH, you little shits!" Hermione shouted as she chased after them with...a giant hammer? "Get back here so I can kill you!"
"Why, we just add some additions to your book!" Fred shouted, "We figured it needed a drawing or two!"
"That was my manuscript you piece of shit!" Hermione said. "It took me hours to make all those copies!"
"From what we read, they weren't all that great you know!"
"Y-you read my..." Hermione stopped chasing after the two boys, as her face became red.
"Yes, though it could use some work," George said, "I'm not too sure you could sell 500 copies with writing that bad!"
"S-shut up, just die already!"
Harry decided to carefully and quietly leave the common room...
After that...experience he'd ended up being slightly terrified of the girl, so when Ron insulted her on Halloween, his heart hammered in his chest as he stared at Hermione who was right behind them. Instead of getting out a hammer and bashing Ron's skull in, she instead pushed past them and rushed down the stairs.
"...I think she heard you." Harry said.
Then, a few hours later he found himself running alongside Ron as they rushed to warn Hermione about the troll Quirrell had shouted about. They reached the first girls' lavatory, only for said troll to end up crashing through the wall. The troll rolled along the floor for a good few feet before coming to a stop, seemingly killed by whatever was in the lavatory.
"Did you honestly think a low-level monster like you could beat me in a fight?!" Hermione said as she rested her hammer against shoulder. "Seriously how stupid could you be?!"
Hermione blinked as she noticed Harry and Ron watching her in silence.
"You know, on the one hand she seems pretty cool," Ron said, "But on the other hand, I think I'm terrified of her."
