Yes, he is the GMPC in a RPG setting. As this is heroic fantasy with few or no subversions to the plot ever, the other characters are written as not meta enough

Yes, he is the GMPC in a RPG setting. As this is heroic fantasy with few or no subversions to the plot ever, the other characters are written as not meta enough to note that they are in a story, and the author of the story put his avatar in there. As to what a GMPC is: https://tvtropes.org/pmwiki/pmwiki.php/Main/GMPC https://tvtropes.org/pmwiki/pmwiki.php/Main/GMPC