Yotsuba

Yotsuba Koiwai started out as the chaotic little green-haired protagonist of *Yotsuba&!*, just casually discovering how the world works one random adventure at a time, but the internet basically gave her a second life. Because “Yotsuba Channel” lined up with 4chan’s Japanese name, she got adopted as the site’s unofficial-official mascot, showing up on banners, ban screens, and especially 404 pages—earning her the nickname “404 Girl.” At some point she stopped being just a manga character and became weirdly baked into old internet culture, like 4chan’s little sister who somehow wandered into the lore and never left.