hi hi mousie. i love this question because smashing togehter different media i love makes me so happy. i have a, kind of, DnD au in the works rn and the more i think about it the more ideas i have for it. i think DnD is such a fun concept to play around with and is quite flexible.
i would also love an alchemy of souls au, which is a fantasy k drama i really enjoy.
i also just suddenly thought of a taskmaster au as well, and i think that would actually be so fun and funny. sevngmn as the taskmaster, jsvng as the affable, funny and slightly pathetic assistant. chn and mnh being the contestants that get frustrated and angry when things go wrong. mnh's odd-ball solutions to tasks. let me just jot that down in my notion tracker real quick.
for more general aus i love fantasy so much, i'm excited to try and write some fantasy for my fantasy bingo card.
also a esports au would be so fun! like jsvng and mnh on rival teams. their league matches get firey. but its a huge scandal when their discord dms (or something) gets leaked and it turns out they've been having nasty cyber sx after comps.