Crossdressing -
https://www.mangago.me/read-manga/isekai_de_shippai_shinai_100_no_houhou/
https://www.mangago.me/read-manga/the_villain_discovered_my_identity/
https://www.mangago.me/read-manga/two_saints_trip_to_the_different_world/
https://www.mangago.me/read-manga/the_villainess_cecilia_silvie_doesn_t_want_to_die_so_she_decided_to_cross_dress/
https://www.mangago.me/read-manga/queen_cecia_s_shorts/
Girl to boy/ boy to girl -
https://www.mangago.me/read-manga/akuyaku_reijou_shomin_ni_ochiru/
https://www.mangago.me/read-manga/saikyou_no_kurokishi_sentou_maid_ni_tenshoku_shimashita/
https://www.mangago.me/read-manga/sword_tiara_and_high_heels/
https://www.mangago.me/read-manga/middle_aged_man_s_noble_daughter_reincarnation/
https://www.mangago.me/read-manga/herscherik_the_epic_of_the_reincarnated_prince/
https://www.mangago.me/read-manga/kenka_bancho_otome_koi_no_battle_royale/