The 4th is a being who acts as the window between reality and fiction.
With the shapes around their neck they create those windows through which we see their world.
The 4th loves drama but zones out a lot, lost in thought.. Especially when the narrative seems to ramble on and on about something small.

The 4th follows the Main Gang on their adventure through various dimensions, though, only Nameless can see them.
The 4th is old friends with Nameless and likes it when Nameless makes jokes relating to the real world. Nameless, in return, likes entertaining The 4th with these little jokes between them and the audience.