Ludociel is one of the Four Archangels of the Goddess Clan and serves as their de facto leader, commanding the holy faction known as Stigma. He is the older brother of Mael, another of the archangels. Physically, he appears as a tall figure with long dark blue or black hair, four angelic wings protruding from his back, and golden armor. He typically keeps his eyes closed, and when he opens them they lack pupils. In the present story arc, he takes possession of Margaret, the daughter of the King of Liones, using her body as a vessel to participate in the conflict, a possession that causes her body to age rapidly.

Ludociel is a complex figure whose personality is defined by a rigid sense of duty and an unwavering devotion to the Supreme Deity. He presents a calm and composed exterior but holds a deep-seated contempt for the Demon Clan, regarding them as insects to be exterminated. He is a strategic and analytical thinker, capable of meticulous planning, but his methods often cross moral boundaries. He uses a spell called Fraudulent Light to brainwash humans into fighting for him, sacrifices innocent demons as bait to lure out the Ten Commandments, and attempts to kill Escanor upon witnessing his Sunshine ability. Despite these ruthless actions, he also aids the human kingdoms by joining forces with Liones, rescuing Gilthunder from the sorceress Vivian, and attacking the demon Zeldris. His ultimate motivation is to fulfill the Supreme Deity's will by eradicating all demons and eliminating Meliodas, whom he sees as a threat.

In the story, Ludociel plays a major role as a commander in the renewed Holy War against the Demon Clan. He leads the archangels Sariel and Tarmiel, who sometimes serve as a moral check on his more extreme decisions. His relationship with Elizabeth is marked by conflict: she opposes his genocidal approach and advocates for peace, while he insists that demons are unworthy of mercy. He also shares a deep rivalry with Meliodas, rooted in their opposing allegiances and the history of the war. Ludociel does not undergo major personal change; he remains steadfast in his convictions, but his actions force other characters—and the audience—to question the nature of heroism and righteousness.

Ludociel is considered the strongest of the Four Archangels. His abilities center on light manipulation, including ultra-high-speed swordsmanship, the creation of powerful barriers, and the use of high-level healing and support magic. His signature technique, Flash, allows him to move at blinding speeds that even powerful demons like Zeldris struggle to react to. He can also unleash a massive barrier of light known as Omega Ark, which can envelop and destroy large numbers of demons. Through his possession of Margaret, he is able to project his full power into the mortal world during the Imperial Wrath of the Gods arc.