My comic, Space School, has an ace character (Joe) as one of the leads, and Alkaline, the second main character, is demisexual.
Space School is mostly about the main characters figuring stuff out together, but still has a big section about being ace, so I felt it was worth mentioning.
My friend's comic, TSFHJ has some ace-leaning characters as well, especially in later chapters. (She's currently updating her archive right now.
Being ace is never directly mentioned but is heavily implied, so this is more so if you wanna enjoy a murder mystery thing that's also /pretty dang ace/
And as a side note, my friend NomnomNami makes amazing games, all with ace characters in them. Check 'em out, they are all free.
Thanks for the nice thread!