I'll have to do a proper search sometime and make a whole organized post, but this author was in my AO3 bookmarks and writes some delightful Redwall fic: https://archiveofourown.org/users/ScrivenerSavannah/pseuds/ScrivenerSavannah/works?fandom_id=233390

I just finished re-listening to the Mattimeo audiobook! It's such a good one. It's a shame there isn't a Pearls of Lutra audiobook, because I love that story so much, but Mattimeo is another beloved story. (I could say that about every book, though, I think! I don't recall ever disliking any of them, though I did prefer some over others.)