Fushigi Yuugi manga series, the four beast gods each have seven warriors, the Genbu Seven, the Byakko Seven, the Seiryuu Seven, and the Suzaku Seven. In the Harry Potter series of novels by J.K. Rowling , seven is said to be the most powerfully magical number. There are a number of references to seven in Harry Potter : there are a total of seven books in the series; Ginny Weasley is the seventh child and only daughter of the Weasley family; Harry Potter was born in July, the seventh month of the year; Wizarding students must complete seven years of school at Hogwarts ; There are seven secret passages leading out of Hogwarts ; Seven is also the number on the back of Harry Potter's Quidditch robes ( Prisoner of Azkaban movie) . Professor Moody was also hidden in a chest with an underground cubby, which was locked with seven locks Harry Potter and the Goblet of Fire . In Quidditch each team consists of seven players. Chapter four of Book 7 is titled "The Seven Potters". Lord Voldemort planned in making six Horcruxes (objects containing parts of his soul), so that his soul would exist in seven parts, although he made an extra one. In the Septimus Heap series, Septimus Is the seventh son of a seventh son, 7 is believed to be the most magykal number. There will also be 7 books in the series, along with many other things relating to the number 7. In George R.R.