What books/movies/shows/comics would natives speakers recommend?
Probably getting ahead of myself since I am just beginning but what extra resources are good to help us work on fluency?
The two best, best resources for self-learning, apart from Duolingo itself, for visual learners, are the series of videos on pronunciation on youtube:- https://www.youtube.com/user/welshplus
and the Big Welsh Challenge course :- http://www.bbc.co.uk/wales/learnwelsh/bigwelshchallenge/ (click on 'enter course', then 'skip introduction'), the section 'practice with tutor' is particularly useful, especially the male South Wales presenter, who is a well know, very funny Welsh actor.
For auditory learners 'Say something in Welsh' is very good and has a wide network of supporters in particular its popular facebook group. https://www.saysomethingin.com/welsh/course1