Losing everything at a very young age,Ciel makes a contract with a demon calls Sebastian Michaelis to gain his revenge in exchange for his soul.He is portrayed to be emotionless and driven to achieve his goal by any mean necessary.However,as the series progresses,he confesses to being the way he is so that he will not lose anything,or rather,anyone important to him ever again.Here is ciel cosplay costume:
http://www.eshopcos.com/black-butler-ciel-phantomhive-costume-first-generation