I need help. I'm looking manga where the character is concubine at harem and she/he strong...

I hate to recommend on going things, but I didn't have anything completed. '^'

http://www.mangago.me/read-manga/sabaku_no_harem/

Mc isn't in the harem, but it's so closely related and there's so much drama concerning it that I had to include it : http://www.mangago.me/read-manga/kusuriya_no_hitorigoto/

Not exclusively about harem drama, nd the girl is actually the empress:
http://www.mangago.me/read-manga/no_doubt_in_us/

One shot, but it was nice c:
http://www.mangago.me/read-manga/adele_to_darius/

It's alright, I'm so in the mood with this plot so thank you so much (≧∀≦)