As the name suggests, the purity-intelligence chart is a representation of a person’s purity and intelligence. The chart’s x-axis denotes intelligence, with negative values meaning not smart and positive values meaning smart. The chart’s y-axis denotes purity, with negative values meaning degenerate and positive values meaning seiso or wholesome.
During Hololive EN’s second collaboration, this chart was drawn up and each person was placed on it. The outcomes of this were:
Despite Kiara’s placement, the chat, along with Kiara’s character artist huke, insisted on placing her bottom left. Since then, the fans and Kiara herself run with the joke, resulting in the term “bottom left” referring to behavior that is both degenerate or horny and not smart. Kiara even has a bottom-left arrow as one of her emotes. She later said it was okay to call her bottom left in situations where it’s appropriate, but calling her bottom left all the time made her feel frustrated.