Responses
I haven't read that manga but I think this mc is far from mary sue: http://www.mangago.me/read-manga/raise_wa_tanin_ga_ii/
Also very physically strong: http://www.mangago.me/read-manga/oh_lord_jesus/
Can some recommend me a shoujo where the mc is either a wallflower or a wild child?
Something like this?
http://www.mangago.me/read-manga/kageno_datte_seishun_shitai/
Or where she is incredibly physically strong or violent.
Just not your typical Mary sue.