Baby Beel comes from Beelzebub, the Japanese manga by Ryūhei Tamura that began in 2009 and was adapted into an anime in 2011. His full name is Kaiser de Emperana Beelzebub IV, a demon lord's son sent to Earth and raised by delinquent Tatsumi Oga. The character became popular for the contrast between his supposed world destroying destiny and his behaviour as a real infant. Clips of his cries later circulated on soundboards and in fan edits, where anime fans still use them as a shorthand for cute but terrifying power.