Leviathan - Going to a Con in the Human World

Leviathan is a tsundere and an otaku. He spends almost all of his free time watching anime, reading manga, or in some way consuming media. His laptop used for Student Council work has a giant picture of the character Seraphina plastered onto it. In the chat The Guest Room, it is revealed that Levi uses the guest room in Purgatory Hall as his own personal manga storage space.

He also spends much of his time playing video games, which he shows a talent for. He owns multiple gaming consoles, including one similar to the Nintendo Switch seen in the opening Sinful Indulgence, and a game console similar to a PlayStation 4 seen in Episode 2 of the Obey Me anime. He tells MC in the chats titled Future Dream 1 and 2 that his dream is to become a pro gamer. However, after successfully becoming the Devildom's first e-sports champion in the Devilgram A Pro Gamer Is Born!, he decides against starting a pro career.

Leviathan is a hikikomori and rarely leaves his room, choosing to take online classes instead of having to go to school and often has high anxiety when he's forced to attend social gatherings.

As the Avatar of Envy, Leviathan can be easily turned to jealousy and self-pity. He often remarks about how situations are "unfair" and how "lucky" others are. He does not think very highly of himself, often calling himself a "worthless otaku," and assumes others do not think highly of him as well. In Beelzebub's Devilgram Unspoken Affection, the results of the D.D.D. app "Demon Brain Scan" reveal that 70% of Leviathan's brain is taken up by "jealousy and feelings of inferiority." His jealousy also can cause him to lash out in anger, and he frequently uses his ability to summon the sea creature Lotan as a threat.

Leviathan is shown to have a talent in sewing, as first revealed in the Summer Festival Pop Quiz. He learned this skill by making cosplays for himself. His sewing ability is called upon once more when Simeon asks him to sew all the costumes for the Pop Quiz Henry and the Seven Lords.

Appearance [Human World Form]: Leviathan has indigo-colored hair with side-swept bangs that slopes to his left, eyes that are orange with a purplish gradient, and very pale skin. Like all of the demon brothers, he has painted nails that are sometimes cyan and sometimes dark indigo. He and Asmodeus are the only brothers with an inconsistent nail color.

Despite being shown to have defined abs, Levi is very out of shape. He can't jump rope and run one lap around the House of Lamentation in the Devilgram Love, Friendship, and Justice.

Leviathan wears an unzipped three-colored hoodie that's half orange, half dark blue with white, light blue, and black accents. Underneath it, he has a simple white shirt with a black collar. He also has a pair of headphones that match his hoodie, in an orange and black color palette.