[i]Good Girl Bad Girl[/i] is a brand created by Loter Inc. in 2005. The concept centers around an [[angel and devil]] couple of girls, one a blue themed proper person and the other a [[red skin]]ned trickster looking for fun. A pilot cartoon for the concept was considered, but never got off the ground.

In 2024, the concept blew up in popularity thanks to an old music video promoting the characters being shared on [[TikTok]].
good girl bad girl