After finishing Harry Potter and the Goblet of Fire, it is apparent that Harry has already experienced various forms of influence from elder characters, both positive and negative. Harry has always known the abuse and negativity of the Dursleys. He has been introduced to the love of the Weasleys. He has also fallen under mentorship of various authoritative figures within Hogwarts. He has even found strong friendships in Ron and Hermione. During the second half of this book, we see Harry grow fond of Cedric Diggory (and vice versa). The friendship that is formed between these two during the trials of Triwizard Tournament is sweet to witness because we are able to watch Harry overcome petty feelings with maturity. Apart from Cedrics relationship with Cho and the mistreatment that Harry receives from Cedric's father, Cedric proves himself to be a great older friend for Harry. 

    They take turns helping each other through the various challenges of the tournament, and the winning scene of the tournament serves as a representation of what the whole tournament's purpose is - bringing wizards together. It's sad to say, but of course there had to be some form of disappointment immediately after. Cedric's tragic death is the first intense form of heartbreak for readers in this series. His character was beginning to serve as another positive influence from an older student at Hogwarts (apart from any of the Weasleys). Just when we began to connect with Cedric and saw the young relationship between him and Harry, he was ripped away from us with no good reason. His death was simply a ploy to stir up Harry. Now Harry has an added burden of feeling like he is the reason that another person has died.