Idk If these are what your looking for but a few a recently read that fall in those lines.
https://www.mangago.zone/read-manga/how_to_live_as_a_bootleg_healer/ [not regression but summoning I think? The Mc is pretty ruthless not in the same way but more of a scammed 'my way or the high way' type. But he could be consider neutral good. And he's a Healer but a Healer who can fight. Alot of the commentors say he look like Kim Dokja so i suppose hes okay looking idl]
https://www.mangago.zone/read-manga/terminally_ill_genius_dark_knight/ [not regression instead reincarnation. It has its fair share of fighting! Mc isn't that ruthless but he's questionable. The tags don't say it's a harem so I don't think it is, but warning it may be. Also nice looking Mc white hair type <3]
https://www.mangago.zone/read-manga/chronicles_of_the_martial_god_s_return/ [okay not regression per say, can't really explain it but Mc is OP and a God. I think it's kinda comedy based and a but of drama but Mc or someone else is usually fighting and he can be REALLY ruthless when he wants but more in a comedic way. He picks up a daughter along the way <3. And he's good looking.]
https://www.mangago.zone/read-manga/jobless_monster_player/
[immature be completely honest this isn't my first recommendation for anyone I don't even like it but I'll just add it to the list. This time it is regression! Mc is cute if you consider the art style. But he don't really fight if you consider things but always in fights. And it's kinda werid and nonsensical but some people like it so.... also he practically pick up a daughter too... if you call that thing one. And he's kinda ruthlessm??? In a stupid way]
Get schooled
Hold up one more list bc I realized I read alot. These next few have a lot of chapters you can binge if your feeling it or like it
https://www.mangago.zone/read-manga/regressor_instructional_manual/ [This actually may be what your looking for strong (he uses people) Mc he isn't technically a regressor but he might as well be, and he's REALLY RUTHLESS a asshole to put it lightly. But hes purposely attractive and theres alot of fighting]
https://www.mangago.zone/read-manga/my_daughter_is_the_finall_boss_paperbag/ [he isn't ruthless he's just in it for his daughter but he's a regressor father with basically a wife!]
https://www.mangago.zone/read-manga/is_this_hunter_for_real/ [who gave the camera man a shovel? Anyways soon to be open MC who fights with a shovel and was originally a camera man Hella strong and he's okay looking]
https://www.mangago.zone/read-manga/the_newbie_is_too_strong/ [he is too strong lol]
https://www.mangago.zone/read-manga/damn_reincarnation/ [strong kinda attractive Mc who reincarnates]
https://www.mangago.zone/read-manga/my_little_brother_is_the_academy_s_hotshot/uu/nml_chapter-2/1/ [He's a regressor who's in it for his brother! He's strong and sent to an academy]
https://www.mangago.zone/read-manga/archmage_transcending_through_regression/ [my bad I low-key forgot what this was about its been a while, but it's regression so I'll recommend it anyways]
https://www.mangago.zone/read-manga/revenge_of_the_iron_blooded_sword_hound/ [ruthless, but it's a reincarnation Mc looks good and he's reborn in the enemy family, and he gets real strong]
Thank you so much!! Ive looked at the mc and most are what im looking for, including your other reply. This will keep my occupied, thank youuu! I love you so much dude /p
bro u should make a list
Im looking for something with fighting and all that! I absolutely would love if theres one where mc has a cute face but is absolutely ruthless (≧∀≦) would love if its a regression storyline as well ^^
https://www.mangago.zone/read-manga/the_100th_regression_of_the_max_level_player/
Sorta like him, I like his out of game appearance! His cruelty and his smarts :3