Godparent

A godparent was an individual who sponsored a child.

The Fourth Doctor told Sarah Jane Smith that he was asked to be a godparent to George VI. (PROSE: Wolfsbane)

The Eleventh Doctor claimed to have had a godmother. (TV: Vincent and the Doctor)

The fictional character Cinderella had a fairy godmother. The First Doctor reluctantly played the role of the fairy godmother in a performance for a Lapino, who required the emotions generated from it to power its spacecraft. (PROSE: Planet of the Bunnoids)