Well, I know you said no main or long comics, but my main does have a bonus comic strip at the end of each episode, so that's what I'm primarily promoting here.
Jerry The Brain Geribl is a bonus comic strip at the end of each "Donnie The Fighting Psychopath" episode. The strip tells the tale of Jerry, a botched lab experiment created with the intention of making dumb people smart again.
I also have a comic strip called "Holiday Horrors" with a new strip coming out around certain holidays. (Mostly U.S. Based)