@NerdyGayGirl I was thinking of having the reader be a Titan-Shifter! There aren't much Armin X Reader stories where the reader is a Titan-Shifter. Although, I don't want them with the warriors.
Or, perhaps the reader can be from the Underground District and was taken by Erwin along with Levi, Farlen and Isabel. Only that she was a very small child. Too young to join the Survey Corps. She stays with the Survey Corps and is kinda like a new member of the family. By the time she is in training, there would be Eren and the rest of the peeps. She is, kinda with average with strength.