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.