For a start I guess I’ll just share the EOU manga, which is being translated by aariachang24. You can submit fanart or memes (I don’t know if you can do that via mangadex though, so here’s the Reddit post). https://www.reddit.com/r/EtrianOdyssey/comments/13jo6ax/etrian_untold_manga_guy_here_give_me_fan_art/

There’s also the webcomics and the EO2 manga: https://mangadex.org/title/2c1ed758-4d64-4735-949e-e5148afa389e/sekaiju-no-meikyuu-comics

https://mangadex.org/title/c51bfb68-f09c-4fdf-8545-b7731a24eea6/etrian-odyssey-ii-the-snowflake-girl