TV-Series
Description
Leonard, also known as the Demon Cleric, holds a significant position within the Demon King Castle hierarchy as one of the Ten Guardians. A demon over 500 years old, he predates periods like Japan's Heian and Kamakura eras. He oversees the "Demon Church" area, primarily tasked with resurrecting deceased castle inhabitants, a frequent necessity due to Princess Syalis and others perishing in her schemes. He consistently urges the princess to value her life after each resurrection.

Physically, Leonard stands 190 cm tall with navy blue hair and indigo eyes. His demonic traits include curled horns, rectangular pupils, black goat-like ears, claw-like black-painted nails, and a long devil tail. His standard attire features a white long-sleeved shirt and trousers with black boots, topped by a long blue garment bearing yellow embroidery. A black strap with a golden clasp rests on his shoulder, and he wears a black necklace with the Demon Church symbol. He completes his look with a blue and white bishop hat also displaying the symbol.

Mild-mannered and caring, Leonard tends to worry excessively and often becomes involved in misunderstandings. He possesses a strong sense of duty and discipline, reflected in meticulous habits like regular haircuts and a preference for well-ironed clothes. Despite his nature, he shuns violence. His life undergoes a significant emotional transformation as profound romantic feelings for Princess Syalis develop, evolving from platonic fondness and protective doting into intense attachment. This fuels pronounced jealousy toward other males interacting with her, including Twilight the Demon King and Poseidon. He struggles deeply with these emotions, experiencing self-loathing and making repeated, unsuccessful attempts to distance himself. His jealousy manifests physically, such as attacking Twilight over misunderstandings. His attachment drives extreme actions, like planting a bomb to harm the Hero, Dawner, whom he views with particular hostility after learning of the princess's childhood history with him.

Leonard's past contrasts his present demeanor; in youth, he displayed delinquent behavior, dressing spikily and carrying a chain sickle. Accounts from his cousin, Kamosh, indicate protective actions even then, like beating up succubi harassing Kamosh. He shares a long-standing, brotherly bond with Twilight, whom he has cared for since childhood, a relationship complicated by his feelings for the princess, leading to increased confrontations. He employs a succubus named Bussy, who resembles the princess, using her both to manage his emotions and as a body double during human kingdom missions. He interacts with other castle inhabitants like Great Red Siberian.

Numerous quirks define his existence. He hides candy in his hat, primarily for the princess, and enjoys specific foods like seasoned rice, sticky seasoned rice, whelk sushi, red bean dumplings, and demon brown rice tea. He adds green onions to his pork soup and dislikes cold toilet seats and messy hair. His hair length fluctuates with strong emotions. He engages in pottery, creating items like a spiky mug symbolizing his heart, and teaches resurrection magic at demon fortresses during business trips. Professionally, he battles using paper talismans and casts curses via voodoo dolls, though curses rebound with a prevention spell. He avoids reading manga and dislikes horror movies despite finding them slightly amusing. He naturally detects Princess Syalis's presence, even across rooms, and acknowledges his developing stalker-like tendencies after encountering a kamaitachi stalking her. Instances of his negligence led to the princess transforming into a cat or a zombie, and he himself once turned into a teddy bear demon. The mechanical boss M.O.T.H.E.R. labels him Hazardous Leak Target A; they arrived at the Demon King castle simultaneously under Morpheus's supervision.