Muggles' Guide to Harry Potter/Characters/Walden Macnair

Overview
Walden Macnair is a tall, strapping wizard, with a thin black moustache.

Prisoner of Azkaban
Macnair is the designated executioner for the Committee for the Disposal of Dangerous Creatures, a committee in the Ministry of Magic. He is brought to Hogwarts School to execute Buckbeak.

Goblet of Fire
Lord Voldemort, on his return from near-death, tells Macnair that he will soon have wizards to kill. There being no other Macnairs mentioned to date, we can assume that this is the same Macnair to whom we have already been introduced.

Order of the Phoenix
Macnair served as one of Lord Voldemort's envoys to the Giants, and it seems he helped to persuade them to join forces with the Death Eaters. According to Hagrid, Macnair got along well with the new leader of the giants due to both having bloodthirsty personalities.

He also fought in the battle in the Department of Mysteries where he was partnered with Avery, though it's unknown if the duo encountered Harry during the initial chase. He later took part in the battle in the Room of the Veil, where he strangled Harry in an attempt to force the prophesy from him. He was wounded by Neville Longbottom in the final battle when Neville poked Hermione Granger's wand through the eyehole in his Death Eater mask, allowing Harry to stun him.

Deathly Hallows
Macnair was briefly seen at the end being defeated by Hagrid in the final battle by being thrown across the Great Hall.

Strengths
It's unknown if this could be considered a strength, but Macnair seems to be one of the more violent Death Eaters. He is described many times as being willing to kill, even enjoying it.

Relationships with Other Characters
It is uncertain how Macnair gets along with other characters. He is one of the twelve Death Eaters at the battle in the Ministry, and he and Lucius Malfoy seem to know each other at that point. There is some indication that he and Malfoy have some connection with each other at the time Macnair is sent to execute Buckbeak.