7 is a magical number in Harry Potter. There are 7 Harry Potter books. Also, wizards are considered adults when they are 17. Number 4 Private Drive is Harry's address for most of the books. 12 Grimmauld place is Harry's inherited house.
no
Harry Potter attempted to use crucio on Bellatrix Lastrange and later used it on Amycus Carrow.
yes
Prongslet is a term sometimes used in the Harry Potter fandom or in fanfiction to describe Harry. It's employed because of James Potter's marauder nickname, Prongs. Since Harry is his son, you can sometimes see Sirius Black or Remus Lupin calling him Prongslet in various fanfictions. The term has never been used in any of the books or movies, and is purely fan-made.
English
Not sure what you mean: if a name is not in the books and movies, it wouldn't qualify as a "Harry Potter name".
Muggles
if you are asking about the font it is New York Times
In Chapter 7 of Harry Potter and the Deathly Hallows: The Will of Albus: Pressing it to his lips, a cryptic inscription in Dumbledore's handwriting
The leaky cauldron is a cauldron that is used to make various potions by mixing ingredients into it. The cauldron appears in harry potter books, films and games.
Reparo a spell that is used alot through the books 3-7
Digitalis is not a spell in Harry Potter.
No. If she was she probably would have used more Wiccan traditions for the Harry Potter books.
It is an English surname. Recently used by author J.K.Rowling in the character Bertha Jorkins in the Harry Potter books.
no
Yes.,