Mavis (Humanized) is a privately owned diesel shunter who works at the Ffarquhar Quarry and previously the Sodor Slate Quarry.

For her appearance, Mavis had Black and Yellow short hair and had Black earrings all over her ears she also wears a short black shirt and shows her top chest showing her Cleavage covering her breasts but showing the top a bit, her black shorts are way above her thighs and she wears short yellow and. Black socks with Black boots, and her fingernails were black.