Doujinshi is basically amateur manga. A lot of them are based on other series, or fanbooks, and sometimes there some fan novels. This list is of the translated fanbooks that are all safe for work. There are also some western zines included because I felt like it.
GeneralTeddie Comic A sweet comic about Teddie's loneliness.
Teddie Hanamura Another sweet comic about Teddie, this time about family.
USA x EnglandSparkling Summer Love An highschool au doujin that will give you diabetes. Honestly, anything by HOBBY HOBBY will give you diabetes.
3WAY In which America turns into a woman and then a child. This doujin is weird.
1775 An angsty Revolutionary War comic
Mystery Solved Another highschool au doujin but this time it is from Seychelles' perspective.
Candy Lover England gets a magical power and turns himself into a child.
A Letter From A Certain Astronaut Feels feels feeeeels.
England x JapanThe Fox and the Foreigner An au where England is a foriegner in Isolated Japan and Japan is a mythical fox.
ZinesHome Sweet Home (Fanzine) The art is seriously high quality and I wish I could eat the pages.
Puella Magi Madoka Magica
Madoka Kaname x Homura AkemiKiss or Chocolate A short and sweet (pun intended) Madohomu comic.
Edward Elric x Winry RockbellYou see, actually I'm... A post-canon doujin about the life of Edward and Winry's married life.
ZinesSoul Binds A zine about Edward and Alphonse's brotherhood.
Royal Pain A zine dedicated to best boy Ling.