Janice is the main antagonist for Season 3. She is the younger sister of Jewlie and revealed herself after influencing Chiri's change in behavior. After the events of the Kami Idol Grand Prix, Janice now takes her sister's job as the goddess of PriPara.
Unlike Jewlie, she is a lot more serious as a goddess and tries to keep to the rules.
(Source: PriPara Wikia)