Erica Mori Aka Polly Yangs And Alice Flore Aka Best Official

Erica Mori with the alias Polly Yangs and Alice Flore known as Best. The "aka" makes me think these are pseudonyms or stage names. Maybe they're characters in a story? Or perhaps real people with multiple names? I should check if there's any existing references to these names online to see if they're known personalities, but since I can't browse the internet, I'll have to proceed without that.