Diluc-sama

https://www.mangago.me/read-manga/kumo_desu_ga_nani_ka/ (spider fmc, weak to strong)

https://www.mangago.me/read-manga/survive_romance/ (dont let the title trick u, there is no romance and it is such a good horror/psychological read, absolutely life changing)

https://www.mangago.me/read-manga/samurai_in_another_world/ (AMAZING. SO GOOD. LIFE CHANGING. actually such a gem of a story, its so so so good)

i also have a list of more badass fmcs if u want to check it out!!
https://www.mangago.me/home/mangalist/2635480/

thank u ٩(๑❛ᴗ❛๑)۶

https://www.mangago.me/read-manga/shiawase_gohan_maki_to_hanazawa/
https://www.mangago.me/read-manga/koishite_kissshite_kanjaitai/
https://www.mangago.me/read-manga/koishite_kissshite_kanjaitai/
https://www.mangago.me/read-manga/my_lovely_bunny/

https://www.mangago.me/read-manga/zure_ga_aru_nimo_hodo_ga_aru/
wrong link lol