(I am going to try my best to describe him.. Not much is said of his childhood.. neither of his eye-colour, or parentage..e.t.c.. So it's going to be really hard, since I don't want to change a thing about him, and I don't think anyone else does either.. So here's the most I know..)
Name: Remus John Lupin
Age: 15
Year: Fifth
House: Gryffindor
Wand: 14 inches (unknown core and wood) -->
The closest picture I could find of his wandFamily: Half-Blood
Appearance: Hair: Light brown
Eyes: ??

(What he may have looked like...)
Personality: Remus is very intelligent, calm, tolerant, gentle, and good-natured. He sees the good in almost everybody and is extremely forgiving. He also has an excellent sense of humor and is one of the Marauders (of course). He could be described as the mature one in the group.
Remus is afraid of turning into a werewolf. He might be afraid of the transformation itself, or the fact that he could harm, infect, or kill his friends and family while transformed, and know that he did it himself.
Pet: None
History: Born March 10th, 1960As a child, Remus was bitten by the werewolf Fenrir Greyback as a result of his father offending the man. Since the invention of a cure was unavailable at the time, his parents were afraid that he would have been unable to attend Hogwarts. Luckily, Albus Dumbledore seen reason to allow him in, and prepared an area where Remus was able to take on his monthly transformations apart from everyone else, past the hidden path located underneath the Whomping Willow, into the Shrieking Shack (which had gotten it's name due to Remus's cries during his transformations.) Dumbledore had made sure that the belief that the place was haunted was held up so that no one would wander into harm's way.
Since he was deprived of any human victims as a wolf, Remus obtained many personally inflicted cuts and scars.
He had made good friends with fellow Gryffindors, James Potter, Sirius Black, and Peter Pettigrew, who had became the Marauders. And in their second year, the other three had found out about Remus's lycanthropy, and instead of shunning him like most others would do, had become Animagi in order to help Remus through the full moon. There was no harm since werewolves are only a danger to humans and not animals.
As he is more of the mature member of the Marauders, Remus was given the title of Prefect as he entered the fifth year.
Anything Extra: As Remus is a werewolf, the shape a Boggart takes in front of him is the Full Moon, since he is afraid of the transformations that take place.
His Patronus has no distinctive shape, though it appears to be a shield.
"Lupin's failing is he likes to be liked. That's where he slips up – he's been disliked so often he's always pleased to have friends so cuts them an awful lot of slack." - J.K. Rowling Just had to add this since it is a great pic of the Marauders together 