YES, as soon as i saw this thread Heroes of Thantopolis came to mind, so happy to see Stront pitching this story kickass comic here!
Other comics i read with at least one Aro/Ace main protagonist are:
Ghost Junk Sickness, which has Vahn, who is also nonbinary and uses they/them pronouns. I'm 100% sure they're ace, and am 99% sure I read they're aromantic. They might be grey or demiromantic, as they r part of a few soft romantic scenes.
GJS is about a duo of space bounty hunters who are also being hunted themselves by a mysterious and dangerous entity known as "The Ghost" (who makes up that whole top part with the eyes and the teeth, wow). Also their messy, messy pasts u-u
(Vahn is the one in the kilt!)
And also Cosmic Fish has a lot of aro/ace characters! I really need to catch up and hope i don't butcher the description too much, but I remember at least a few of the main group was aro/ace.
It's a comic about people who used to be humans (or aliens, but there are definitely ex-human aro/ace characters) who have become ghost-monsters and don't really remember much of their pasts. It's often pretty lighthearted, but it can be very intense.
(sorry for so many edits i am a spelling mistake and clumsy-wording master!)