Bellatrix Lestrange, a character from the "Harry Potter" series, is depicted as fiercely loyal to Lord Voldemort and highly devoted to his cause. She is sadistic, unpredictable, and dangerously unhinged, often exhibiting a gleeful and maniacal demeanor when inflicting pain. Bellatrix is utterly devoted to dark magic and has a cruel and ruthless nature. Her personality is marked by her intense hatred for Muggle-borns and her willingness to commit heinous acts in the service of Voldemort.