Iwkmm

Here you go:
(harem, the mc actually ends up with who i wanted so :) the rest get happy endings of their own) http://www.mangago.zone/read-manga/four_way_stop/?Akg2
(harem, isekai, ongoing) http://www.mangago.zone/read-manga/i_took_a_trip_to_an_otome_game/
(harem, oblivious mc, the rest get a happy ending) http://www.mangago.zone/read-manga/my_four_masters/
(harem, isekai, ongoing, historical) http://www.mangago.zone/read-manga/straight_princess_in_the_royal_palace/
(harem, isekai, ongoing, oblivious mc) http://www.mangago.zone/read-manga/galge_no_sekai_de_shinyuu_ga_ore_o_sukida_to_iidashite/
(this isnt a harem one, more like a love triangle, but it feels very similar for some reason haha, fluff, oblivious mc) http://www.mangago.zone/read-manga/dasadanan/