From the Super Mario Wiki
Novbi is the controller of the Nimbi elevator, called the Overator. His name comes from "November" and his girlfriend, Fallbi, is named for the season that contains that month (in the Northern Hemisphere). When Novbi is first encountered during Super Paper Mario, he is frozen solid. Fallbi asks the player for help. Novbi is finally reunited with his sweetheart after being thawed out by Bowser's fire breath. Novbi, if asked, can activate the elevator that he controls and ferry the player to another area of the Overthere.