Recs

Basically Shoujo isekai. The reverse harem stuff and that. Usually the otome villainess trope is a bit like that.

So I'm not exactly sure about any of these, but this is what I have:

More sure:
http://www.mangago.zone/read-manga/it_s_virtually_impossible_to_make_this_boy_like_me/
http://www.mangago.zone/read-manga/i_m_thinking_of_quitting_the_villainess_entourage/
http://www.mangago.zone/read-manga/the_reincarnated_cross_dressing_princess_cannot_find_a_marriage_partner/
http://www.mangago.zone/read-manga/the_result_of_being_reincarnated_is_having_a_master_servant_relationship_with_the_yandere_love_interest/
http://www.mangago.zone/read-manga/lady_rose_wants_to_be_a_commoner/
http://www.mangago.zone/read-manga/the_emperor_s_companion/

IDK:
http://www.mangago.zone/read-manga/lady_baby/


Less sure:
http://www.mangago.zone/read-manga/miss_not_so_sidekick/
http://www.mangago.zone/read-manga/jishou_akuyaku_reijou_na_konyakusha_no_kansatsu_kiroku/
http://www.mangago.zone/read-manga/otome_game_no_hametsu_flag_shika_nai_akuyaku_reijou_ni_tensei_shite_shimatta/
http://www.mangago.zone/read-manga/of_course_i_ll_claim_palimony/
http://www.mangago.zone/read-manga/the_villiainess_is_adored_by_the_crown_prince_of_the_neighboring_kingdom/
http://www.mangago.zone/read-manga/i_m_not_a_villainess_just_because_i_can_control_darkness_doesn_t_mean_i_m_a_bad_person/
http://www.mangago.zone/read-manga/it_seems_like_i_got_reincarnated_into_the_world_of_a_yandere_otome_game/
http://www.mangago.zone/read-manga/i_m_a_villainous_daughter_so_i_m_going_to_keep_the_last_boss/
http://www.mangago.zone/read-manga/rebirth_of_villianous_life_of_letizia_after_engagement_abandonment/
http://www.mangago.zone/read-manga/milady_just_wants_to_relax/
http://www.mangago.zone/read-manga/though_i_may_be_a_villainess_i_ll_show_you_i_can_obtain_happiness/

The "Reincarnation" tag will usually get you those stories. They're basically Reverse Harem Isekai.

Here are some of my favorites:
(sorry that they're all webtoons XD)

http://www.mangago.zone/read-manga/doctor_elise/

http://www.mangago.zone/read-manga/survive_as_the_hero_s_wife/

http://www.mangago.zone/read-manga/the_reason_why_raeliana_ended_up_at_the_duke_s_mansion/

http://www.mangago.zone/read-manga/la_dolce_vita_di_adelaide/


http://www.mangago.zone/read-manga/the_duchess_50_tea_recipes/

http://www.mangago.zone/read-manga/miss_not_so_sidekick/

http://www.mangago.zone/read-manga/sincerely_i_became_a_duke_s_maid/

http://www.mangago.zone/read-manga/daughter_of_the_emperor/?av=1


http://www.mangago.zone/read-manga/iris_lady_with_a_smartphone/