Twm'nast the Imitator was an Eiradynic Wizard of Folklore. He is a Father Christmas-type character.
Twm'nast comes from Twm (the Welsh form of Tom). The name is derived from Thomas Nast who created modern image of Father Christmas. The name also comes from the 'Welsh Wizard' Twm Siôn Cati, a figure of Welsh folklore.