Sae Niijima

Sae is a dedicated prosecutor and guardian for her sister, Makoto. However, she's overworked due to Japan's work pressure and constantly stressed. She resents Makoto because their father died in the line of duty, forcing Sae to raise her alone. This has made Sae hyper-competitive and obsessed with success at all costs, even if it means framing innocent people. Her trust issues lead her to suspect everyone who befriends the protagonist as accomplices of Phantom Thieves. Envy towards others fuels her growing disillusionment with her profession which manifests in a Palace resembling a casino where she rigs games against the Phantom Thieves before going berserk during battle quotes about justice being rigged rules favoring one side. Despite these flaws, Sae isn't without compassion or standards; she loves her sister deeply and shows concern for the protagonist despite considering him a criminal initially.

Appearance: Sae is a tall and beautiful woman with upper-back length, ashen-brown hair that is asymmetrically parted on her right side and brown eyes that are sometimes depicted with a hint of mauve red. She wears a black business suit with a black turtleneck. Her blazer's cuffs and the lower front have clamshell-like designs. Accessory-wise, she wears a necklace of a section sign (§) which references her judicial occupation (it also appears in the top right of Shujin Academy's emblem), earrings and a few dark hair clips can be seen above her right ear. She has violet fingernails and wears dark gray pantyhose with black high heels. She is sometimes seen with a smartphone and a black bag slung over her shoulder.

Shadow Sae has yellow eyes, extremely thick black eyeliner and black lipstick. She still wears her earrings, but she now has a black choker with spikes and a hat that resembles an American flapper from the 1920s, with playing cards stashed behind a golden rose. She wears a revealing black dress with purple laces which exposes the center of her torso and her right leg. Her legs are decorated with fishnet stockings, with the exposed right leg having a derringer pistol, and she wears purple high heels. She wears long black gloves. In addition, she also has tattoos on her shoulders and back which is a black dog's head wearing a choker surrounded by yellow roses.

While she does not initially transform into a demon form during her boss fight, she becomes Leviathan after the Phantom Thieves get past her cheating. Leviathan resembles a giant knight in black spiked plate armor, a helmet resembling a horned demon, several large firearms (such as a rocket launcher) mounted on her right hand and wielding a large red sword in her left hand.