Leviathan

Leviathan is a legendary Demon Lord with the form of a colossal shark. She is associated with the sin of envy.

Appearance
Leviathan has the appearance of a giant shark over thirty metres in length, rivalling a submarine in size.

Personality
Leviathan is driven by envy, the very sin that she is associated with. She envies her fellow demon lord Yurina Amatsu for being able to obtain the love of a family without doing anything (from the Leviathan's perspective), while Leviathan cannot do the same due to being feared by others. She is willing to attack Yurina and those around her out of envy.

Leviathan sees herself as the strongest being and sees the world as being too fragile to let her use all of her power. She enjoys facing someone who can challenge her, even if that person is a human. She feels disappointed when she is denied the opportunity to use her full power.