"Leviathan is a prominent character in the Japanese manga series ""A Love Contract with the Devil"". He is a demon prince and a member of the seven princes of hell. His name appears several times throughout the manga, and he is a central character in the story.

Leviathan is one of the most powerful demons in the demon world, and he is known for his incredible strength and magical abilities. He is often depicted as cold and uncaring, but he is also fiercely loyal to his allies and will stop at nothing to protect them.

Despite his intimidating appearance, Leviathan is actually quite charming and has a sense of humor that is often noted by other characters in the manga. He is known for his sharp wit and sarcastic remarks, which can often lighten the mood in tense situations.

Leviathan also has a complicated relationship with the main character of the manga, a human girl named Mina. Although he often clashes with Mina, he also has a strong attraction to her and will do anything to protect her. This leads to a complicated love triangle between Leviathan, Mina, and another demon prince named Lucifuge.

Throughout the manga, Leviathan is depicted as a multidimensional character with complex motivations and emotions. Although he is one of the villains in the story, he is also a sympathetic character with an interesting backstory that reveals more about his past and his motivations.

Overall, Leviathan is an intriguing and complex character in ""A Love Contract with the Devil"". His name appears frequently throughout the manga, and he plays a central role in the story as one of the seven princes of hell."