Snappy is based on a painting known as the Aqua Dolphin. It was said that the painting was based on a story of a lying dolphin.
Snappy is a demon who collects souls and it has bewitched Tomoko, taking her soul into Paradigm X and putting his painting, Aqua Dolphin, into the VR Art Museum. During the fight itself, he absorbs magic and must be defeated by allowing him to absorb too much magic, which causes him to overload and die. The fact that he dies after absorbing too much magic, despite saying that he likes it, is hinted earlier by a student who states that dolphins lie. A similar hint comes from talking to Puts or Garrote in the Ghost Waterfall painting, in the form of a tale he tells of a man who died from gorging on his favorite food without limit.
Devil Children Black Book & Red Book[]
"A cute dolphin with a halo on his head and angel wings. He's always deceiving people by lying."