There were also a number of unseen characters at different points in the show's run.

He was an unseen character at first, and even then very rarely referred to.

Instead, he returned with a wife, Jen, who remained an unseen character for some time.

Most of the characters, seen and unseen, are involved with literature.

The investigation was launched by another unseen character known as the Chairman.

It was one of the first shows to have an unseen character.

These unseen characters are the owners of the real estate agency.

Stan was an unseen character during the show's run, despite being mentioned in many episodes.

In his letters, the narrator refers to several other unseen characters.

He is an unseen character (except for a hand and part of his clothes).