Last game I played at I think the only person who knew his canon was Rika, and that's only because I believe me rping him prompted her to pick up the books
his species were enslaved to be spaceships so I do think it would be extremely funny if Matthew is occasionally like "why do I get the faintest hint of Taxicab™ from this completely non-magical dude"
They are great books! Though they are also written with a dense prose style that isn't for everyone (I have found in my experience that people's responses to it are usually either love or hate, there is no in-between)
if I do app Matthew, and he ever gets into the Engine Room, it will, uh, probably be a bit of a shit show