Peter Pettigrew
An animagus that can turn into a rat, Peter is sure one sly person. He avoided his punishment in Azkaban and caused Sirius to suffer instead. Always being a coward, he tried to seek protection by becoming a death eater under Voldemort.

When Peter, Lupin, Sirius and James had still been in school, they were always running around together, especially during the fifteeth day of each month. Peter was the dimmest of the quad and when becoming an animagus for the sake of Lupin, Peter had the most trouble. However James and Sirius helped him.

Peter literally worshipped James because of his talent on the Quidditch field. And James always loved the attention. That is probably why Snape called James an airhead, because his head had gotten so big after all the compliments.

Peter, in order not to incur the wrath of Voldemort, gave him one arm for one of the ingredients to make Voldemort a new physical body. That secured his posotion as one of Voldemort's most loyal servants. In replacement for his arm, he was granted a new one, made from magic and is silvery in colour.

And now, in the Prince, Peter is living in Snape's house, under the orders of Voldemort, to assist Snape. However, seeing Snape's long-living hatred for the bunch of people who once ago had bullied him, Peter is not likely to have an easy life. That could be seen when Snape ordered him to bring him drinks. Well, after all, Peter deserved this humiliation from Snape, who asked him to escape imprisonment in the first place?

signed, miaochen