There's also one called "Twin Role"
another one is this
http://www.mangago.zone/read-manga/akuma_de_sourou/
idk if you like action/adventure shoujos but i love Akatsuki No Yona, the main character starts as a weak princess but she changes a lot. ヾ(☆▽☆)
i dont know if i helped but i forgot the names of shoujos i read.
They all have strong female leads, but only the last two have the kind of fighter-woman thing you're looking for.
Ouran Koukou Host Club, Sennen no Yuki (she is physically very frail, but is a brave girl with a strong personality), Gokusen, and Inari, Konkon, Koi Iroha. (this is a must-read).
Also, are male leads okay? If so, Ludwig Kakumei, Makai Ouji and Last Game.
I feel like I've been having too much yaoi in my life. Can anyone recommend a good shoujo or josei? None of those with whiny helpless bitches as the main lead tho because they turn me off. I prefer ones with warrior princesses than damsels in distress.