Initially, Flowey operates under a façade of friendliness and politeness. He often greets the protagonist with "Howdy!", calls himself "your best friend," and, like his father, appends polite words such as "gosh" and "golly" to the ends of his sentences. Whenever he drops this guise of friendliness, he often calls the protagonist an "idiot."

Flowey has an overly cheery voice when kind, and a rather crazed an insane sounding voice when he drops his facade of kindness