Myreading has much more set of Dj than here and you can use the filter category to make ur searching time much easier.. The only difference is they have raw while it's pure English here.
I check MRM daily haha, but I haven’t found any villian deku doujins at all.
I don’t think there are.. my ex is a big fan of villain Deku too and she like read every DJ with Deku in it and still there was no villain deku. I wonder why they won’t make one.. Anyway. This did give me villain Deku vibes though.
https://myreadingmanga.info/mameya-haunted-boku-no-hero-academia-dj-eng/
So there’s a lot of BNHA doujin. And there’s a lot of villian deku fanart. But is there a villian deku doujin??? I have yet to see one.