* Fred Weasley: His death at the Battle of Hogwarts is particularly heartbreaking because it's so sudden and unexpected, and it leaves his twin George utterly devastated.
* Dobby: Dobby's sacrifice to save Harry and his friends is deeply moving, especially because it's a selfless act of love from a character who has always been loyal and devoted to Harry.
* Severus Snape: Snape's death is a complex and emotionally charged event, filled with revelation and tragedy. His sacrifice to protect Harry, and the reveal of his lifelong love for Lily, is one of the most powerful moments in the series.
* Sirius Black: Sirius's death at the hands of Bellatrix is a painful loss for Harry, and the tragic circumstances of his demise make it especially difficult to swallow.
* Albus Dumbledore: While not as sudden as some other deaths, Dumbledore's death is impactful because of the powerful bond he shared with Harry, and the bittersweet nature of his sacrifice.
Ultimately, the "saddest" death depends on your individual connection with the characters and the specific moments that resonated with you. Each of these deaths, and others in the series, contribute to the powerful and emotional journey of the Harry Potter story.