YA means Young Adult, the target audience that comes after teens and kids. I don't think we have an equivalent - we have Jugendliteratur, but we don't really have anything for Junge Erwachsene in specific.

Thanks for the recs. :) I was hesitant to include Ronja because I remembered her and Birk's relationship as romantic rather than strictly on a sibling-basis, but if I misremember, up it goes.

Ooh, another Librivox enthusiast! I've considered volunteering ever so often, but I'm just not a very good reader, so I'm hesitant. I used to volunteer as a proofreader for Gutenberg-related sites quite a bit a few years back, I love initiatives like these.