Komui's younger sister, and assistant Head Officer. She is Chinese, and 16 years old. Her parents were killed by an Akuma when she was very young. Because she is an Accommodator, the Black Order took her away from her only remaining family member (Komui) to Headquarters against her will. For three years she was never allowed to leave the place, which felt like a prison to her. Because she attempted suicide, she had to be restrained and tied to her bed. However, once Komui joined the Black Order, Lenalee became more at ease in the Headquarters. She once told Allen that her "world" consists of her friends and family; if something terrible were to ever happened to them, it is the same as part of her world being destroyed. It is implied that she has a crush on Allen.

She has a strong sense of friendship, which sometimes causes her emotional pain (or causes her to fight with her comrades). While Allen was training to regain his Innocence back with Baku (of the Black Order's Asia Headquarters), he finds numerous pictures of Lenalee, coming to a conclusion that Baku is stalking her (or perhaps just infatuated).

Birthday: 20th Febuary

She is an Exorcist whose anti-Akuma weapon was a pair of boots, or "Dark Boots" (黒い靴). However, Lenalee has complained that her Dark Boots were always heavy and that it hurt to wear them. When invoked, it greatly increases one's speed and strength in the legs. Her boots allowed her to use the following techniques:

Onkyou no Tougi: Otokase (音響の踏技 「音枷」, lit. Step Skill of Sound: "Sound Shackles"): Gives Lenalee the ability to interface with sound waves, solidifying the sound of each step into a surface while achieving sonic-speeds.

Suijou no Tougi: Mizukase (水上の踏技 「水枷」, lit. Stepping Skill on the Water: "Water Shackles"): Allows her to interface with water, enabling her to walk perfectly on water surfaces.

Enbu Kirikaze (円舞「霧風」, Waltz: "Mist-Wind"): Stirs up a destructive tornado with a whirling kick of her Dark Boots.

Shittsui no Tougi: Tetsukase (失墜の踏技 「鉄枷」, lit. Falling Footwork: "Iron Shackles"): Upon maximum invocation, her Innocence's power is condensed unto her Dark Boots, meshing them into a morass of blades, carrying an oppressive weight.

Information obtained from:http://en.wikipedia.org/wiki/List_of_Black_Order_members#Lenalee_Lee