At last, J.K. Rowling offers further insight into Remus Lupin in Short Stories From Hogwarts of Heroism, Hardship, and Dangerous Hobbies.
Initially introduced as Hogwart's new Defense Against the Dark Arts professor in the third Harry Potter book, Lupin slowly found his way into the hearts of several fans all over the muggle world.
Due to his condition, however, he was not as popular among his colleagues.
Lupin's ailment was one that forced him to transform into a werewolf during the full moon. Rowling explains in her book that she used Lupin's condition to draw a comparison to illnesses today that carry certain stigma, like HIV/AIDS.
Rowling reveals that, in an attempt to get revenge on his father, Lupin was bitten as a child. He was then isolated from other children and later by society. Lupin's family was constantly concerned with keeping the condition a secret as to avoid any shame and danger.
“The wizarding community is as prone to hysteria and prejudice as the Muggle one,” Rowling says. “And the character of Lupin gave me a chance to examine those attitudes.”
Although it may seem that Lupin lead quite the sorrowful life, Rowling makes sure to remind us that despite his condition Lupin ended up quite happy. After coming to Hogwarts he managed to find people who loved him regardless of his condition and who eventually became life-long friends.