This is timely because I started setting up a Redbubble store for Milhamah a couple of days ago.
Currently I'm selling merchandise based off existing prints of main characters. Plus, for items like stickers, I have some simple designs of characters in interesting poses.
Because I'm still starting out as a comic, I'm hoping to make my products relevant to non-readers by combining some of them with inspirational quotes, pithy slogans, or jokes.