Bellatrix was a criminally insane witch with intensely sadistic and brutally violent tendencies. She possessed a fierce and dangerous temper, a trait that she shared with her cousin Sirius and her aunt Walburga and which was likely a result of the inbreeding that plagued her birth family. Bellatrix was one of Voldemort's cruellest Death Eaters, always eager to inflict the Cruciatus Curse on enemies. Harry Potter noted that she was as "mad as her master." Likely for these reasons, Bellatrix was slavishly devoted to Lord Voldemort and was willing to do anything for his cause. She believed to have proven her loyalty by her time in Azkaban, an event which had seemingly furthered her mental decline. Bellatrix had the classic "great good looks" and arrogant bearing common for members of the House of Black. She was a tall woman with long, thick, shiny dark hair. Her face had a strong jaw, a thin mouth, and dark, heavily lidded eyes with long eyelashes. As a Death Eater, Bellatrix bore the Dark Mark on her left inner forearm. However, (like her cousin Sirius Black) her lengthy imprisonment in Azkaban took a toll on her appearance. Her face became gaunt and skeletal, but she still managed to retain vestiges of her great beauty. Overall, Bellatrix was obsessed with blood purity and took immense pride in the aristocracy of her family since a young age. Like all the rest of Lord Voldemort's followers, she was vehemently against all half-bloods, Muggle-borns, Muggles, and half-breeds. She had a particular disdain for blood traitors, having no qualms towards killing members of her own family, including her cousin Sirius and her niece Nymphadora, whom she sought to kill with great determination. Bellatrix was intelligent and a natural leader, taking charge in tricky situations. These traits were shown during the Battle of the Department of Mysteries and the Skirmish at Malfoy Manor. The latter event was a mark of her decisiveness and ruthlessness, as she took no unnecessary prisoners (preferring to kill them instead) as she planned to do with a group of Snatchers who attempted to defy her. However, Bellatrix could be easily distracted and reckless, especially in battle with opponents that appeared to be (or were) weaker than herself. Bellatrix was also egotistical and arrogant, described by Harry as "treat[ing] everyone like scum" in a rather taunting way. She had immense confidence in her skills and never hesitated to jump into battle against any auror or Order of the Phoenix member.