XXX

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

http://www.mangago.me/read-manga/the_beginning_after_the_end/?av=1

http://www.mangago.me/read-manga/solo_leveling/ ????????????????????????

not isekais but yuh

person above already said the beginning after the end which is pretty good, but I also like a returners magic should be special. I typically read isekais with female leads since I’m a girl and I like the genre and all, but most male lead ones have a bunch of fan service harems and ditzy girls and the like, but with this one all the characters actually feel balanced and stuff. though Mc feels just a tad OP/like a Gary Stu but it’s not super bad so the story is still enjoyable.

I'll try find some male lead isekai without harem...

So I'm not sure if all of these fit, but here:

Alone/Pair:
http://www.mangago.me/read-manga/dungeon_seeker/
http://www.mangago.me/read-manga/sozai_saishuka_no_isekai_ryokouki/
http://www.mangago.me/read-manga/skeleton_soldier_skeleton_soldier_couldn_t_protect_the_dungeon/

Romance:
http://www.mangago.me/read-manga/botsuraku_youtei_nanode_kajishokunin_wo_mezasu/

Not Sure:
http://www.mangago.me/read-manga/kanzen_kaihi_healer_no_kiseki/
http://www.mangago.me/read-manga/fukushuu_kansuisha_no_jinsei_nishuume_isekaitan/
http://www.mangago.me/read-manga/nidome_no_yuusha/

Just Action:
http://www.mangago.me/read-manga/kamitachi_ni_hirowareta_otoko/
http://www.mangago.me/read-manga/a_returner_s_magic_should_be_special/