Romilda Vane
Romilda Vane was a Gryffindor House student that had a crush on Harry Potter.
Romilda Vane grew interest into Harry Potter believing he was the Chosen One that shall take down Lord Voldemort. She even tried out for the Quidditch team but she miserably failed.
She purchased love potion from the Weasley’s Wizard Wheezes and infused them in to a package of chocolate.
Harry Potter was observing the Marauder’s Map as he was suspicious of Draco Malfoy since he witnessed him in Borgin and Burkes at Nocturn Alley.
Ron Weasley ate Harry’s pack of chocolate and Ron became the one who suddenly fell into an obsession on to Romilda. Harry Potter had to take Ron to Slughorn’s office due to Romilda’s plot. After Romilda found out that Ginny Weasley started to date Harry Potter, she would ask numerous questions to Ginny of their relationship.
Dragon Blood
Horace Slughorn used dragon blood as an attempt to cover up his existence while he hid from the death eaters moving from one muggle house on a trip to another. Albus Dumbledore was also famous for discovering twelve usages of dragon blood.
Dragon blood was literally the blood of a dragon and it was one of the key ingredients for the Wolfsbane Potion that helps werewolves maintain their sanity while they transform to wolves under the full moon.
Professor Galatea Merrythought
Galatea Merrythought was a former professor for the Defense Against the Dark Arts. Horace Slughorn demanded the office of former Professor Galatea Merrythought while he accepted the offer of Professor for Potions when Albus Dumbledore visited him at Budeligh Babberton.
Professor Galatea Merrythought taught Tom Riddle also known as Lord Voldemort.
Tom Riddle or Lord Voldemort wanted to take the seat of Professor Galatea Merrythought after knowing that she was about to retire. Eventually by the objection of Albus Dumbledore,
Tom Riddle or Voldemort failed to become the Professor for the Defense of the Dark Arts. Tom Riddle or Lord Voldemort casts a very powerful curse on the professor for the Defence Against the Dark Arts that made a professor only last for a year in his rage.
Lavendar Brown
Lavendar Brown was a Gryffindor House witch who was also a member of Dumbledore’s Army. Lavendar Brown was room mates with Parvati Patil and Hermione Granger but Lavendar Brown and Hermione didn’t get along quite well.
Lavendar Brown was a fan of Divination as for her Professor Sybill Trelawney’s predictions were really accurate.
Lavendar Brown grew a crush on Ron Weasley and they’ve started dating which made Hermione Granger upset as she thought Ron as a date for Slughorn’s Christmas Party.
This was the second time that complicated Hermione’s emotions while the first was the Yule Ball dance where Hermione was upset with Ron as Ron treated her as a backup which made her upset that she accepted the date with Viktor Krum.
However Lavendar Brown couldn’t resist the ‘friendship’ between Ron Weasley and Hermione Granger and their two-month relationship wrecked.
Cormac McLaggen
Cormac McLaggen was a Gryffindor House wizard whose family members were in the high ranks of the Ministry of Magic.
Cormac McLaggen’s uncle Tiberius McLaggen was friends with the new Minister for Magic and former head of the Auror’s Office Rufus Scrimgeour.
He was a good keeper but he couldn’t make the Gryffindor Quidditch team until the graduation of the former Captain Oliver Wood. However Cormac McLaggen was arrogant and had a swagger that cost him a lot. He constnatly had a crush on Hermione Granger which Hermione didn't feel comfortable.
He hit Harry Potter’s head with a bludger that cost the defeat of Gryffindor House against Hufflepuff and rather than keeping the hoops, he constantly questioned and interfered with the team tactics. Eventually Cormac McLaggen was removed from the team granting Ron the first team seat as keeper.
Weasleys' Wizard Wheezes
While Molly Weasley was upset of the Weasley twins for quitting Hogwarts as she wanted them to settle down with a job, the Weasley twins successfully founded the Weasley’s Wizard Wheezes at Diagon Alley. They’ve started from owl mail posting service from home and went all the way to making business in Diagon Alley.
Fred and George Weasley has been working to open their business since the moment of Harry Potter and the Goblet of Fire.
The twins started gambling with Ludovic Bagman and even Harry’s Triwizard to raise funds for their business. Eventually Harry Potter loaned the Weasley twins with the prize money he won by winning the Triwizard Tournament, 1,000 galleons.
Harry didn’t want the money anyways because it reminded him of Cedric Diggory constantly.
The Weasley twins bombarded Dolores Umbridge with a potable swamp and fireworks that they’ve invented. The Weasley twins quitted Hogwarts and started to focus on their joke shop business.
They’ve sold love potions, pimple makers and various kinds of wizarding jokes.
Fred And George also gave Harry Potter privilege of having anything in the Weasley’s Wizard Wheezes for free as a courtesy for the 1,000-galleon loan.
The Weasley twin’s business was so successful they were thinking of merging and acquiring Zonko’s Joke Shop in Hogsmeade which they eventually didn’t due to the raised security in Hogsmeade.
