绿坝娘 (lǜ bà niáng)
"Green Dam Girl" is a personification of the Chinese government's filtering software "绿坝·花季护航 (Luba Huaji Huhang, Green Dam Youth Escort)".
At first, her figure resembled Kawashiro Nitori. But later, her various designs appeared. In most versions, she wears a hat with the symbol of '河蟹 (hexie, River crab)' .
She has regionally various names. If you're searching for her pictures in Pixiv, try all these tag names: