Lately I was thinking about having some recurring characters in my series -Like, for example Adam, Eve and God from a par of comics related to the Garden Of Eden)
This is because I noticed that we as readers then to "engage" a lot more with recurring characters than changing in every comic. Even if it's super simple.
A recurring one can be a character that it's a representation of an artist (I have two or three comics in "queue" related to art or drawing).
Here and idea, I would call him RGB or something similar.