Belphegor

Belphegor has dark indigo-grey, white-tipped hair with long bangs that cover his right eye, and violet eyes with a pink gradient like his twin Beelzebub. Like all of the demon brothers, Belphegor paints his nails and specifically wears cerulean blue nail polish. Asmodeus claims that Belphegor has the nicest smile.

Demon Look

When taking his demon form, Belphegor reveals his two twisted rams horns as well as his long, cow-like tail that — according to Issue 5 of the RAD Newspaper — has the occasional thorn and is prickly to the touch. His demon outfit has a cow motif with his black hoodie having a cow-like pattern and a horseshoe stitched on its upper right side. The hoodie is designed with four buckles at the front with one being belted properly. Inside, he wears a blue shirt while the inside of the hoodie shares the same color. He wears black baggy harem pants with a belt of magenta and blue triangles on the right side. His short combat boots reveal the cow-spot birthmarks on his right ankle, which also appear on the right side of his neck.

Casual Look

Belphegor wears a hooded shawl jacket with one blue and white striped pocket on the left side of the chest. The inside of the hood is in the color of bright blue. The jacket is buttoned in the middle; the third button is the one enclosed. The jacket's cuffs are white and it also has two white stripes on the right sleeve. He wears yellowish-brown pants and brown laced leather boots that reach his knees.

When in his casual attire, Belphegor carries a cow-patterned pillow with a cow tail strapped to it at all times.

RA Uniform

Belphegor wears the standard RAD uniform. His top is shorter compared to the others, reaching only his waist thus resembling a normal length school uniform and has two unbuttoned buttons. With the length of his uniform, he is revealed to be wearing a white belt. Inside, he wears a well-buttoned collared green shirt and blue necktie.

Human World Look

Belphegor wears a light blue shirt with a black and white heartbeat pattern on it, which also has a black collar and a black and white hem on the bottom. On it, he wears an asymmetrical windbreaker, with a right sleeve that is white with a black stripe on it, and a left one that is black with a white stripe on it. The windbreaker has light green and indigo accents, and a white hoodie.

Always napping and constantly sleepy, Belphegor is the second youngest of the demon brothers but ranked as seventh due to his powers.

Belphegor sometimes has a brisk temper, but he's also proactive, efficient, sensible, and mellow. He isn't particularly sociable, but makes an exception for MC, who he likes to cuddle and take naps with. He also lies about the fact that he doesn't like to be pet. He isn't the type to say sorry or accept apologies from others, for he sees an action or gesture as an act of forgiveness far stronger than words.

Belphegor is rebellious and he does not care for any higher authorities, especially Diavolo and his whims. He is naturally manipulative and a great actor, posing to MC as a human prisoner of Lucifer's when they first met. It wasn't until MC identified him as Belphegor by recognizing his portrait that he admitted his identity. Additionally, it's mentioned by several of his brothers that he has the ability to manipulate them as well, using this ability to get out of things he finds tedious. He is supposedly a yandere character. This is based on the title of his Japanese card "The Yandere Seventh-Born" ("The Catnapping Seventh-Born" in English).

As seen in both the Devilgram Searching for Jack and in the chat Belphie's Artistic Skills, Belphegor has no artistic skill.