Oskar Schell is an amazing character. Despite being devastated by his father's death, he is charming, hilarious, and completely loveable. 
 He makes friends with everyone he meets. 
 He employs tactics of a forensic scientist. 
 He constantly writes letters to famous people like Stephen Hawking. 
 To refrain from cursing he says things like "Succotash my Balzac, dipshiitake."