The Fault In Our Stars (the book)

This book has many character strenghts like optimism, grit, optimism and social intelligence. 

Grit in the scene when Augustus got very sick and Hazel was supporting him and telling him that he could get better. 

Optimism because Hazel tries to make happy Augustus knowing that he is very sick and could die.

Social Intelligence at the end when Hazel takes care of Augusts and treats him better because she knows that he is worst that her.