There is an overarching theme of death within the wizarding world; therefore, it is no surprise that the most important artifacts and arcs within Harry’s story are the Deathly Hallows. As detailed within the book of the same name, anyone who unites the Deathly Hallows will become a master of death. Each of the Deathly Hallows corresponds and is a representation of characters within the series. To start, the Elder Wand corresponds to the character of Voldemort. Voldemort’s ruthless quest to “live forever” is what leads him to create the horcruxes. His fear would only grow upon itself once his own curse was rebounded onto himself from Harry and ge was reduced to almost nothing. Voldemort would not meet Death completely. He would become so close to it, however, that once he regained support and power, he would become unreasonable and unrelenting in his quest to find the mythological wand that would make him undefeatable.
The Resurrection Stone is the next of the Deathly Hallows and it corresponds to Snape’s character. Snape is a complicated character, with so many dimensions to himself. Snape’s guilt and grief over Lily Potter’s death that fateful night is one that so clearly fills his persona once that information is known. With Harry constantly roaming in and around the castle and the grounds of Hogwarts, Snape is surrounded by Lily’s memory. With this information, it is easy to see how the Resurrection Stone and Snape are connected. Snape would do anything in order to bring back Lily. It is also for this reason that Snape decided to protect and watch Harry during his time at Hogwarts, in honor of Lily’s memory.
Harry has had the invisibility cloak for nearly his entire time at Hogwarts and it has served him greatly throughout. Harry’s connection to the invisibility cloak is such a close one because of his direct relation to the last brother. Harry was able to roam around everywhere because of that cloak. Just like the last brother he has been able to cheat and hide from Death until he is able to ready and understands the sacrifice he has to make as a horcrux.
Death itself can also be referred to as another character within the story. Dumbledore is sometimes theorized to be Death within the entire series. He was given the title of Death because of his actions and power in the series. Dumbledore, at some point or another, was in possession of the each of the Deathly Hallows. He would then turn each into their rightful owner, just as Death handed each brother one of the hallows. It works out because Dumbledore is acutely aware of nearly everything that goes on in the castle, just as Death would be a figure that be aware everyone’s whereabouts and what they were up to in that moment.
Each of these characters are so important to Harry’s story. They all have a lasting impact on Harry himself. J.K. Rowling handles these themes and symbols well enough for children to have a rich understanding of it.