The laugh is associated with Prussia from Hetalia, the series created by Hidekaz Himaruya that developed from a webcomic into manga and anime adaptations. The first Hetalia anime series premiered in 2009, bringing the franchise’s personified countries and recurring character mannerisms to animation. Prussia’s repeated “kesesese” laugh became recognizable among fans through anime clips, compilations, fan videos, and character edits. It remains useful online because its unusual pronunciation quickly signals theatrical confidence, mischief, and gleeful chaos without requiring a longer spoken setup.